Make package FIPS compatible by marking blake2 hashing with usedforsecurity=False

[z4y4ts]

• Add tests for the change. In general, aim for full test coverage at the Python level. Rust tests are optional.
• Add any appropriate documentation.
• Add a summary of changes to the latest section at the top of CHANGELOG.rst. (If it's not there, add it.)
• Add your name to AUTHORS.rst.
• Run just full-check.

Why this change?

In FIPS (Federal Information Processing Standards) compliant environments, Python's hashlib restricts the use of non-FIPS-approved algorithms like BLAKE2 when they might be used for security purposes. However, grimp only uses BLAKE2 to generate safe cache filenames—not for any cryptographic or security purpose.

By explicitly marking the hash with usedforsecurity=False, we tell Python that this hash is not being used for security, allowing grimp to work correctly in FIPS mode without triggering restrictions on non-approved algorithms.

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 23 skipped benchmarks¹

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_{Comparing z4y4ts:patch-1 (a89008d) with main (53dd737)}

Footnotes

1. 23 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Copilot]

Pull request overview

This PR makes the grimp package compatible with FIPS (Federal Information Processing Standards) mode by explicitly marking blake2b hash usage as non-security-related. The change allows grimp to work in FIPS-compliant environments where non-approved cryptographic algorithms are restricted for security purposes.

Changes:

• Added usedforsecurity=False parameter to blake2b hash function call used for generating cache filenames
• Updated CHANGELOG.rst to document the FIPS compatibility improvement
• Added contributor to AUTHORS.rst

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/grimp/adaptors/caching.py	Added usedforsecurity=False parameter to blake2b hash call to enable FIPS compatibility
CHANGELOG.rst	Added entry documenting FIPS compatibility improvement
AUTHORS.rst	Added new contributor Oleksandr Zaiats

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[seddonym]

Thanks for this - today I learned about usedforsecurity.