chore(dependencies): update envier version pin

[ZStriker19]

envier 0.5.1 has the license added correctly, this looks to be the only place it's actually pinned: DataDog/envier#34

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.
• If change 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.

Reviewer Checklist

• Title is accurate
• All changes are related to the pull request's stated goal
• Description motivates each change
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Change is maintainable (easy to change, telemetry, documentation)
• Release note makes sense to a user of the library
• Author has 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

[P403n1x87]

I think there are some riot lockfiles that might need to be updated too (see #7935)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-01-24 23:42:21

Comparing candidate commit c224b00 in PR branch zachg/update_envier_version with baseline commit a266617 in branch main.

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