build(deps): bump zstandard from 0.14.1 to 0.15.1 in /backend

[dependabot]

Bumps zstandard from 0.14.1 to 0.15.1.

Release notes

Sourced from zstandard's releases.

0.15.1

Bug Fixes

• setup.py no longer attempts to build the C backend on PyPy. (#130)
• <sys/types.h> is now included before <sys/sysctl.h>. This was the case in releases prior to 0.15.0 and the include order was reversed as part of running clang-format. The old/working order has been restored. (#128)
• Include some private zstd C headers so we can build the C extension against a system library. The previous behavior of referencing these headers is restored. That behave is rather questionable and undermines the desire to use the system zstd.

0.15.0

Backwards Compatibility Notes

• Support for Python 2.7 has been dropped. Python 3.5 is now the minimum required Python version. (#109)
• train_dictionary() now uses the fastcover training mechanism (as opposed to cover). Some parameter values that worked with the old mechanism may not work with the new one. e.g. d must be 6 or 8 if it is defined.
• train_dictionary() now always calls ZDICT_optimizeTrainFromBuffer_fastCover() instead of different APIs depending on which arguments were passed.
• The names of various Python modules have been changed. The C extension is now built as zstandard.backend_c instead of zstd. The CFFI extension module is now built as zstandard._cffi instead of _zstd_cffi. The CFFI backend is now zstandard.backend_cffi instead of zstandard.cffi.
• ZstdDecompressionReader.seekable() now returns False instead of True because not all seek operations are supported and some Python code in the wild keys off this value to determine if seek() can be called for all scenarios.
• ZstdDecompressionReader.seek() now raises OSError instead of ValueError when the seek cannot be fulfilled. (#107)
• ZstdDecompressionReader.readline() and ZstdDecompressionReader.readlines() now accept an integer argument. This makes them conform with the IO interface. The methods still raise io.UnsupportedOperation.
• ZstdCompressionReader.__enter__ and ZstdDecompressionReader.__enter__ now raise ValueError if the instance was already closed.
• The deprecated overlap_size_log attribute on ZstdCompressionParameters instances has been removed. The overlap_log attribute should be used instead.
• The deprecated overlap_size_log argument to ZstdCompressionParameters has been removed. The overlap_log argument should be used instead.
• The deprecated ldm_hash_every_log attribute on ZstdCompressionParameters instances has been removed. The

... (truncated)

Changelog

Sourced from zstandard's changelog.

0.15.1 (released 2020-12-31)

Bug Fixes

• setup.py no longer attempts to build the C backend on PyPy. (#130)
• <sys/types.h> is now included before <sys/sysctl.h>. This was the case in releases prior to 0.15.0 and the include order was reversed as part of running clang-format. The old/working order has been restored. (#128)
• Include some private zstd C headers so we can build the C extension against a system library. The previous behavior of referencing these headers is restored. That behave is rather questionable and undermines the desire to use the system zstd.

0.15.0 (released 2020-12-29)

Backwards Compatibility Notes

• Support for Python 2.7 has been dropped. Python 3.5 is now the minimum required Python version. (#109)
• train_dictionary() now uses the fastcover training mechanism (as opposed to cover). Some parameter values that worked with the old mechanism may not work with the new one. e.g. d must be 6 or 8 if it is defined.
• train_dictionary() now always calls ZDICT_optimizeTrainFromBuffer_fastCover() instead of different APIs depending on which arguments were passed.
• The names of various Python modules have been changed. The C extension is now built as zstandard.backend_c instead of zstd. The CFFI extension module is now built as zstandard._cffi instead of _zstd_cffi. The CFFI backend is now zstandard.backend_cffi instead of zstandard.cffi.
• ZstdDecompressionReader.seekable() now returns False instead of True because not all seek operations are supported and some Python code in the wild keys off this value to determine if seek() can be called for all scenarios.
• ZstdDecompressionReader.seek() now raises OSError instead of ValueError when the seek cannot be fulfilled. (#107)
• ZstdDecompressionReader.readline() and ZstdDecompressionReader.readlines() now accept an integer argument. This makes them conform with the IO interface. The methods still raise io.UnsupportedOperation.
• ZstdCompressionReader.__enter__ and ZstdDecompressionReader.__enter__ now raise ValueError if the instance was already closed.
• The deprecated overlap_size_log attribute on ZstdCompressionParameters instances has been removed. The overlap_log attribute should be used

... (truncated)

Commits

• bd94614 global: release 0.15.1
• 4a6d2fb setup: bundle and reference additional private zstd headers
• 2faf021 setup: rename variable to reflect local include paths
• 6ee1221 c-ext: include sys/types.h before sys/sysctl.h
• 7123e82 setup: do not build the C backend on PyPy
• 6806272 global: release version 0.15.0
• e2afedc ci: rewrite artifact download script to use GitHub Actions
• 692b302 zstandard: add compress()/decompress() convenience functions
• 72734e0 news: remove some work items that have been addressed
• 1bdba50 compressionparameters: remove deprecated compression_strategy
• Additional commits viewable in compare view

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