Update dependency cachelib to v0.2.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cachelib (changelog)	==0.1.1 -> ==0.2.0

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Release Notes

pallets/cachelib

v0.2.0

Compare Source

Released 2021-06-25

• Support for Python 2 has been dropped. Only Python 3.6 and above are
  supported.
• Fix FileSystemCache.set incorrectly considering value overrides
  on existing keys as new cache entries. :issue:18
• SimpleCache and FileSystemCache first remove expired
  entries, followed by older entries, when cleaning up. :pr:26
• Fix problem where file count was not being updated in
  FileSystemCache.get and FileSystemCache.has after removals.
  :issue:20
• When attempting to access non-existent entries with Memcached,
  these will now be initialized with a given value delta.
  :pr:31

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