Update dependency cachelib to v0.4.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cachelib (changelog)	==0.1.1 -> ==0.4.1

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Release Notes

pallets/cachelib

v0.4.1

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Released 2021-10-04

• Fix break in RedisCache when a host object was passed
  in RedisCache.host instead of a string. :pr:82

v0.4.0

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Released 2021-10-03

• All cache types now implement BaseCache interface both
  in behavior and method return types. Thus, code written
  for one cache type should work with any other cache type. :pr:71
• Add type information for static typing tools. :pr:48
• FileNotFound exceptions will not be logged anymore
  in FileSystemCache methods in order to avoid polluting
  application log files. :pr:69

v0.3.0

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Released 2021-08-12

• Optimize FileSystemCache pruning. :pr:52
• Fix a bug in FileSystemCache where entries would not be removed
  when the total was over the threshold, and the entry count would be
  lost. :pr:52
• FileSystemCache logs system-related exceptions. :pr:51
• Removal of expired entries in FileSystemCache is only triggered
  if the number of entries is over the threshhold when calling
  set. get has still return None and False
  respectively for expired entries, but will not remove the files. All
  removals happen at pruning time or explicitly with clear and
  delete. :pr:53

v0.2.0

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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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