chore(gemfile): concurrent-ruby >= 1.3.7

[ncooke3]

#no-changelog

[gemini-code-assist]

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[paulb777]

LGTM on acceptable CI

[ncooke3]

Integration flakes and Firestore job does not have dependency on Ruby.

Viewed sdk.firestore.yml:1-701

Based on the sdk.firestore.yml workflow file, the sanitizers-mac job does not have an explicit dependency on any particular Ruby version.

Unlike other jobs in that workflow (such as xcodetest_prod or pod-lib-lint-cron which explicitly use the ruby/setup-ruby action), the sanitizers-mac job only sets up Python and CMake:

    - uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548 # v6.1.0
      with:
        python-version: '3.11'

    - name: Setup cmake
      uses: jwlawson/actions-setup-cmake@802fa1a2c4e212495c05bf94dba2704a92a472be
      with:
        cmake-version: '3.31.2'

Any Ruby scripts called downstream (e.g., inside install_prereqs.sh or build.sh) would just end up using the system default Ruby provided by the macos-26 runner environment.