Bump to version 2.12.1

[sarahchen6]

Fixed

• AppSec: Fix ArgumentError from ActiveRecord for Ruby < 2.7 (Fix AppSec ActiveRecord instrumentation for Rails 4 and ruby < 2.7 #4437)

[github-actions]

👋 Hey @DataDog/ruby-guild, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-03-06 13:41:40 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: bump_to_version_2.12.1
Commit report: 6274c5f
Test service: dd-trace-rb

✅ 0 Failed, 20621 Passed, 1459 Skipped, 3m 16.75s Total Time

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.68%. Comparing base (2f427f8) to head (6274c5f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4462      +/-   ##
==========================================
- Coverage   97.70%   97.68%   -0.02%     
==========================================
  Files        1375     1376       +1     
  Lines       83812    83824      +12     
  Branches     4251     4251              
==========================================
- Hits        81887    81886       -1     
- Misses       1925     1938      +13     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-06 14:07:09

Comparing candidate commit 6274c5f in PR branch bump_to_version_2.12.1 with baseline commit 2f427f8 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.