Remove strscan specification in 3.4 gemfile

[sarahchen6]

What does this PR do?
Remove pinned strscan version now that the gem has been updated to 3.1.2.

Motivation:
Keep our gemfiles updated.

Change log entry
No.

Additional Notes:
N/A

How to test the change?
Green CI.

[datadog-datadog-prod-us1]

Datadog Report

Branch report: sarahchen6/update-ruby-3.4-gemfile
Commit report: bd77c35
Test service: dd-trace-rb

✅ 0 Failed, 22128 Passed, 1476 Skipped, 5m 21.05s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-03 10:31:12

Comparing candidate commit bd77c35 in PR branch sarahchen6/update-ruby-3.4-gemfile with baseline commit b1400d5 in branch master.

Found 1 performance improvements and 1 performance regressions! Performance is the same for 29 metrics, 2 unstable metrics.

scenario:tracing - Propagation - Trace Context

• 🟥 throughput [-3972.382op/s; -3864.641op/s] or [-10.359%; -10.078%]

scenario:tracing - Tracing.log_correlation

• 🟩 throughput [+6265.767op/s; +6618.253op/s] or [+5.595%; +5.909%]

[ivoanjo]

👍 LGTM

I'm assuming that once we make master CI green this can be rebased and the job that adds the commit that updates the appraisals will kick in as usual.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.75%. Comparing base (b1400d5) to head (bd77c35).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4250      +/-   ##
==========================================
- Coverage   97.76%   97.75%   -0.01%     
==========================================
  Files        1353     1353              
  Lines       82392    82392              
  Branches     4224     4224              
==========================================
- Hits        80550    80544       -6     
- Misses       1842     1848       +6     

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