v6.1.0

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===================

• Improve LFUCache insertion performance by switching to an
  implementation based on the cacheing <https://pypi.org/project/cacheing/>_ library.

• Update CI environment.

v6.0.0

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• Require Python 3.9 or later (breaking change).

• Remove MRUCache and the @func.mru_cache decorator (breaking
  change).

• Add an optional condition parameter to the @cached and
  @cachedmethod decorators, which, when used with a
  threading.Condition instance, should improve cache stampede <https://en.wikipedia.org/wiki/Cache_stampede>_ issues in massively
  parallel environments. Note that this will inflict some performance
  penalty, and therefore has to be enabled explicitly.

• Convert the cachetools.func decorators to use a
  threading.Condition instance to deal with cache stampede <https://en.wikipedia.org/wiki/Cache_stampede>_ issues. Note that
  this may result in a noticable performance degradation, depending
  on your actual use case.

• Deprecate support for cache(self) returning None to suppress
  caching with the @cachedmethod decorator.

• Improve documentation.

• Update CI environment.