ci: add MySQL 9.7 LTS and slim the functional matrix

[renecannao]

Summary

• Add MySQL 9.7 to the functional test matrix (9.x LTS; mysql:9.7 / lts on Docker Hub)
• Keep 9.6 as the prior innovation line for a transition window
• Drop intermediate 9.0 / 9.2 / 9.5 to reduce CI cost/time
• Unchanged: 5.7, 8.0, 8.4 LTS

Matrix

Before	After
5.7, 8.0, 8.4, 9.0, 9.2, 9.5, 9.6	5.7, 8.0, 8.4, 9.6, 9.7

No product code changes — coverage only. Depends on #108 harness fixes already on master.

Test plan

• CI functional-mysql (9.7) passes
• CI functional-mysql (9.6) still passes
• Other matrix cells unchanged/green

Summary by CodeRabbit

• Tests
  • Updated functional testing coverage to run against MySQL versions 5.7, 8.0, 8.4, 9.6, and 9.7.
  • Removed testing coverage for MySQL versions 9.0, 9.2, and 9.5.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c901dd44-f765-47d3-abc1-d7920c9855f7

📥 Commits

Reviewing files that changed from the base of the PR and between 7a92fae and 7288bfb.

📒 Files selected for processing (1)

• .github/workflows/functional.yml

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📝 Walkthrough

Walkthrough

The functional MySQL workflow matrix now runs against MySQL 5.7, 8.0, 8.4, 9.6, and 9.7, replacing versions 9.0, 9.2, and 9.5.

Changes

Functional MySQL Matrix

Layer / File(s)	Summary
Update functional MySQL versions .github/workflows/functional.yml	The functional-mysql job replaces MySQL 9.0, 9.2, and 9.5 with MySQL 9.7 in its Docker version matrix.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A bunny checks the version line,
Nine-seven joins the testing shine.
Old numbers hop away,
New builds run today—
Clean carrots for the pipeline!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the main change: updating the MySQL functional test matrix and adding 9.7 while slimming older versions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/mysql-9.7-lts-matrix

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