fix: pin importlib to 6.5.0 [backport 2.5]

[github-actions]

Backport c8d5e9f from #8075 to 2.5.

Description

• Pin importlib to 6.5.0 to avoid issue Uncaught Exception when reading Egg information python/importlib_metadata#455
• Fix a potential unbound local error.

Fixes #8068

Checklist

• Change(s) are motivated and described in the PR description.
• Testing strategy is described if automated tests are not included in the PR.
• Risk is outlined (performance impact, potential for breakage, maintainability, etc).
• Change is maintainable (easy to change, telemetry, documentation).
• Library release note guidelines are followed. If no release note is required, add label changelog/no-changelog.
• Documentation is included (in-code, generated user docs, public corp docs).
• Backport labels are set (if applicable)

Reviewer Checklist

• Title is accurate.
• No unnecessary changes are introduced.
• Description motivates each change.
• Avoids breaking API changes unless absolutely necessary.
• Testing strategy adequately addresses listed risk(s).
• Change is maintainable (easy to change, telemetry, documentation).
• Release note makes sense to a user of the library.
• Reviewer has explicitly acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment.
• Backport labels are set in a manner that is consistent with the release branch maintenance policy
• If this PR touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-01-25 21:57:10

Comparing candidate commit 58bb0d3 in PR branch backport-8075-to-2.5 with baseline commit 64ba71c in branch 2.5.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 195 metrics, 9 unstable metrics.