ci: Raise minimum supported aiomysql version and update text matrix

[alexander-alderman-webb]

Description

Bump minimum aiomysql version to avoid test setup on old Python versions.

Clean up environment variables in *.jinja files and run scripts/generate-test-files.sh.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 88480 passed | ⏭️ 6022 skipped | Total: 94502 | Pass Rate: 93.63% | Execution Time: 296m 44s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +54
Passed Tests	📈 +54
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2355 uncovered lines.
✅ Project coverage is 89.89%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.38%    89.89%    +0.51%
==========================================
  Files          192       192         —
  Lines        23285     23285         —
  Branches      8002      8002         —
==========================================
+ Hits         20811     20930      +119
- Misses        2474      2355      -119
- Partials      1309      1328       +19

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