Update dependency cachetools to v5

This MR contains the following updates:

Package	Update	Change
cachetools	major	==4.1.1 -> ==5.2.0

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Release Notes

tkem/cachetools

v5.2.0

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• Add cachetools.keys.methodkey().

• Add cache_clear() function to decorators.

• Add src directory to sys.path for Sphinx autodoc.

• Modernize func wrappers.

v5.1.0

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• Add cache decorator parameters as wrapper function attributes.

v5.0.0

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• Require Python 3.7 or later (breaking change).

• Remove deprecated submodules (breaking change).

  The cache, fifo, lfu, lru, mru, rr and ttl submodules have been deleted. Therefore, statements like

  from cachetools.ttl import TTLCache

  will no longer work. Use

  from cachetools import TTLCache

  instead.

• Pass self to @cachedmethod key function (breaking change).

  The key function passed to the @cachedmethod decorator is now called as key(self, *args, **kwargs).

  The default key function has been changed to ignore its first argument, so this should only affect applications using custom key functions with the @cachedmethod decorator.

• Change exact time of expiration in TTLCache (breaking change).

  TTLCache items now get expired if their expiration time is less than or equal to timer(). For applications using the default timer(), this should be barely noticable, but it may affect the use of custom timers with larger tick intervals. Note that this also implies that a TTLCache with ttl=0 can no longer hold any items, since they will expire immediately.

• Change Cache.__repr__() format (breaking change).

  String representations of cache instances now use a more compact and efficient format, e.g.

  LRUCache({1: 1, 2: 2}, maxsize=10, currsize=2)

• Add TLRU cache implementation.

• Documentation improvements.

v4.2.4

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• Add submodule shims for backward compatibility.

v4.2.3

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• Add documentation and tests for using TTLCache with datetime.

• Link to typeshed typing stubs.

• Flatten package file hierarchy.

v4.2.2

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• Update build environment.

• Remove Python 2 remnants.

• Format code with Black.

v4.2.1

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• Handle __missing__() not storing cache items.

• Clean up __missing__() example.

v4.2.0

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• Add FIFO cache implementation.

• Add MRU cache implementation.

• Improve behavior of decorators in case of race conditions.

• Improve documentation regarding mutability of caches values and use of key functions with decorators.

• Officially support Python 3.9.

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