Bump the dev-deps group with 2 updates

[dependabot]

Updates the requirements on mypy and coverage to permit the latest version.
Updates mypy to 1.19.0

Changelog

Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Drop Support for Python 3.9

Mypy no longer supports running with Python 3.9, which has reached end-of-life. When running mypy with Python 3.10+, it is still possible to type check code that needs to support Python 3.9 with the --python-version 3.9 argument. Support for this will be dropped in the first half of 2026!

Contributed by Marc Mueller (PR 20156).

Mypy 1.19

We’ve just uploaded mypy 1.19.0 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release on Read the Docs.

Python 3.9 Support Ending Soon

This is the last mypy feature release that supports Python 3.9, which reached end of life in October 2025.

Performance Improvements

• Switch to a more dynamic SCC processing logic (Ivan Levkivskyi, PR 20053)
• Speed up type aliases (Ivan Levkivskyi, PR 19810)

Fixed‑Format Cache Improvements

Mypy uses a cache by default to speed up incremental runs by reusing partial results from earlier runs. Mypy 1.18 added a new binary fixed-format cache representation as an experimental feature. The feature is no longer experimental, and we are planning to enable it by default in a future mypy release (possibly 1.20), since it's faster and uses less space than the original, JSON-based cache format. Use --fixed-format-cache to enable the fixed-format cache.

Mypy now has an extra dependency on the librt PyPI package, as it's needed for cache serialization and deserialization.

Mypy ships with a tool to convert fixed-format cache files to the old JSON format. Example of how to use this:

$ python -m mypy.exportjson .mypy_cache/.../my_module.data.ff

... (truncated)

Commits

• 0f068c9 Remove +dev
• 6d5cf52 Various updates to 1.19 changelog (#20304)
• 3c81308 Add draft version of 1.19 release notes (#20296)
• 1999a20 [mypyc] librt base64: use existing SIMD CPU dispatch by customizing build fla...
• 1b94fbb [mypyc] Fix vtable pointer with inherited dunder new (#20302)
• 13369cb [mypyc] Fix crash on super in generator (#20291)
• a087a58 Update import map when new modules added (#20271)
• 35e843c [mypyc] Add efficient librt.base64.b64decode (#20263)
• 094f66d [mypyc] Add repr to AssignmentTarget subclasses (#20258)
• 0738db3 Do not push partial types to the binder (#20202)
• Additional commits viewable in compare view

Updates coverage to 7.12.0

Changelog

Sourced from coverage's changelog.

Version 7.12.0 — 2025-11-18

• The HTML report now shows separate coverage totals for statements and branches, as well as the usual combined coverage percentage. Thanks to Ryuta Otsuka for the discussion <issue 2081_>_ and the implementation <pull 2085_>_.

• The JSON report now includes separate coverage totals for statements and branches, thanks to Ryuta Otsuka <pull 2090_>_.

• Fix: except* clauses were not handled properly under the "sysmon" measurement core, causing KeyError exceptions as described in issue 2086_. This is now fixed.

• Fix: we now defend against aggressive mocking of open() that could cause errors inside coverage.py. An example of a failure is in issue 2083_.

• Fix: in unusual cases where a test suite intentionally exhausts the system's file descriptors to test handling errors in open(), coverage.py would fail when trying to open source files, as described in issue 2091_. This is now fixed.

• A small tweak to the HTML report: file paths now use thin spaces around slashes to make them easier to read.

.. _issue 2081: coveragepy/coveragepy#2081 .. _issue 2083: coveragepy/coveragepy#2083 .. _pull 2085: coveragepy/coveragepy#2085 .. _issue 2086: coveragepy/coveragepy#2086 .. _pull 2090: coveragepy/coveragepy#2090 .. _issue 2091: coveragepy/coveragepy#2091

.. _changes_7-11-3:

Version 7.11.3 — 2025-11-09

• Fix: the 7.11.1 changes meant that conflicts between a requested measurement core and other settings would raise an error. This was a breaking change from previous behavior, as reported in issue 2076_ and issue 2078_.

  The previous behavior has been restored: when the requested core conflicts with other settings, another core is used instead, and a warning is issued.

• For contributors: the repo has moved from Ned's nedbat GitHub account_ to the coveragepy GitHub organization_. The default branch has changed from master to main.

... (truncated)

Commits

• 63db2b1 docs: sample HTML for 7.12.0
• 598bbc3 docs: prep for 7.12.0
• 557dd15 feat: add statement and branch coverage percentages to JSON report (#2090)
• e18359c fix: don't crash if open() genuinely fails. #2091
• fff5e59 docs: thanks, Ryuta Otsuka #2085
• 97bf625 docs: support files for the sample html
• 8320b74 style(html): tweak the styling for the new stmt/branch stats #2085
• 7e08183 feat(templite): {% else %}
• 4abe253 feat: add statement and branch coverage columns to index.html report (#2085)
• ddbafa9 build: no longer need to work around a pytest/iTerm2 bug
• Additional commits viewable in compare view

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