Update dependency cachetools to v4.2.4

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cachetools	==4.1.1 -> ==4.2.4

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Release Notes

tkem/cachetools

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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