chore: standardize/update release please config

[toddbaert]

Standardizes this repo's release-please setup. Part of open-feature/community-tooling#128.

• pin googleapis/release-please-action@45996ed…307cf7 # v5
• token: ${{ secrets.RELEASE_PLEASE_ACTION_TOKEN }}
• signoff configured in release-please-config.json (removes deprecated command/default-branch/signoff inputs); fixes DCO on release PRs
• release gate uses the always-emitted, monorepo-safe plural releases_created via fromJSON(... || false)
• add a concurrency guard to serialize release-please runs

Single signed-off commit; no changes to custom publish/build steps.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 0fadc9f6-e245-40d3-a601-e72c18e99859

📥 Commits

Reviewing files that changed from the base of the PR and between 0b79607 and e891be1.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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📝 Walkthrough

Walkthrough

The release workflow now serializes runs per Git ref without cancelling in-progress runs. It pins the Release Please action to a commit SHA and uses the action’s releases_created output for release_created.

Changes

Release workflow

Layer / File(s)	Summary
Release run coordination and action outputs .github/workflows/release.yml	The workflow groups runs by github.ref and disables cancellation of in-progress runs. It pins the Release Please action to a commit SHA and sets release_created from steps.release.outputs.releases_created.

Estimated code review effort: 2 (Simple) | ~8 minutes

Suggested reviewers: aepfli

Merge Risk: ⚪ Minimal · up to e891b

The release signal is consumed as intended, and runs for the release branch are serialized. No actionable merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: standardizing the repository's Release Please configuration.
Description check	✅ Passed	The description directly explains the Release Please configuration changes, including action pinning, release gating, signoff, and concurrency control.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.27%. Comparing base (0b79607) to head (e891be1).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2045      +/-   ##
============================================
+ Coverage     92.70%   93.27%   +0.57%     
- Complexity      730      732       +2     
============================================
  Files            60       60              
  Lines          1741     1741              
  Branches        203      203              
============================================
+ Hits           1614     1624      +10     
+ Misses           77       69       -8     
+ Partials         50       48       -2     

Flag	Coverage Δ
unittests	93.27% <ø> (+0.57%)	⬆️

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