ci: Unpin Django version for generating test suites

[alexander-alderman-webb]

Description

We pinned it because djangorestframework was incompatible with a Django alpha.
With a new djangorestframework this is no longer the case.

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 📊

✅ 99953 passed | ⏭️ 6623 skipped | Total: 106576 | Pass Rate: 93.79% | Execution Time: 352m 59s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -1576
Passed Tests	📉 -1564
Failed Tests	—
Skipped Tests	📉 -12

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2504 uncovered lines.
❌ Project coverage is 89.99%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    90.02%    89.99%    -0.03%
==========================================
  Files          193       193         —
  Lines        25010     25010         —
  Branches      9032      9032         —
==========================================
+ Hits         22514     22506        -8
- Misses        2496      2504        +8
- Partials      1434      1434         —

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