Work around missing logger dependency in Rails 6.1 and 7.0

[p-datadog]

What does this PR do?

Downgrades concurrent-ruby to 1.3.4 to stop rails 6.1 from failing during bootstrap with the following error:

app_1                 | Run: bin/rails db:create
app_1                 | Traceback (most recent call last):
app_1                 |         14: from bin/rails:9:in `<main>'
app_1                 |         13: from bin/rails:9:in `require'
app_1                 |         12: from /usr/local/bundle/gems/railties-6.1.7.10/lib/rails/commands.rb:3:in `<top (required)>'
app_1                 |         11: from /usr/local/bundle/gems/railties-6.1.7.10/lib/rails/commands.rb:3:in `require'
app_1                 |         10: from /usr/local/bundle/gems/railties-6.1.7.10/lib/rails/command.rb:3:in `<top (required)>'
app_1                 |          9: from /usr/local/bundle/gems/railties-6.1.7.10/lib/rails/command.rb:3:in `require'
app_1                 |          8: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `<top (required)>'
app_1                 |          7: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `require'
app_1                 |          6: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `<top (required)>'
app_1                 |          5: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `require'
app_1                 |          4: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `<top (required)>'
app_1                 |          3: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `require'
app_1                 |          2: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:8:in `<top (required)>'
app_1                 |          1: from /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:9:in `<module:ActiveSupport>'
app_1                 | /usr/local/bundle/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:16:in `<module:LoggerThreadSafeLevel>': uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger (NameError)
app_1                 | 

Motivation:

CI is red on master

Change log entry
None

Additional Notes:

Commit in concurrent-ruby removing logger dependency: ruby-concurrency/concurrent-ruby@d7ce956

Pointer to this being the issue: https://stackoverflow.com/questions/79360526/uninitialized-constant-activesupportloggerthreadsafelevellogger-nameerror

The issue affects Rails 6.1 and 7.0. 7.0 is fixed in rails/rails#54263. I take it 6.1 is not going to be fixed ever. When the next release after 7.0.8.7 comes out we should be able to remove the pin on concurrent-ruby from Rails 7.0 applications.

How to test the change?
Existing tests

[datadog-datadog-prod-us1]

Datadog Report

Branch report: rails-6-logger-fix
Commit report: 70c5145
Test service: dd-trace-rb

✅ 0 Failed, 22200 Passed, 1477 Skipped, 5m 23.26s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-16 18:17:30

Comparing candidate commit 70c5145 in PR branch rails-6-logger-fix with baseline commit fe9272b in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 30 metrics, 2 unstable metrics.

scenario:profiler - Allocations ()

• 🟥 throughput [-306483.271op/s; -292427.555op/s] or [-9.149%; -8.729%]