Update dependency testfixtures to v8.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
testfixtures	==8.1.0 -> ==8.2.0

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Release Notes

Simplistix/testfixtures (testfixtures)

v8.2.0

Compare Source

• The strict option is now correctly respected when :doc:comparing <comparing> nested objects.

• When comparing :class:~datetime.datetime or :class:~datetime.time instances, if the fold is the only thing that's different, it's now shown in the output.

• A more detailed exception is now raised when resolving a :doc:replacement <mocking> doesn't give what's expected.

• :doc:Replacement <mocking> of methods on instances is now prevented when strict=True.

• An exception is now raised when :doc:mocking <mocking> and the original is not in the __dict__ of its containing objects.

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