ci: Add tiktoken to uv typing group

[alexander-alderman-webb]

Description

Add tiktoken to the typing dependency group and fix the resulting mypy errors.

Resolve

sentry_sdk/integrations/openai.py:133: error: Unused "type: ignore" comment  [unused-ignore]

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 📊

✅ 130596 passed | ⏭️ 7110 skipped | Total: 137706 | Pass Rate: 94.84% | Execution Time: 475m 59s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2509 uncovered lines.
✅ Project coverage is 90.25%. Comparing base (692cca2) to head (b71a773).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.25%    90.25%        —%
==========================================
  Files          193       193         —
  Lines        25724     25724         —
  Branches      9504      9504         —
==========================================
+ Hits         23214     23215        +1
- Misses        2510      2509        -1
- Partials      1435      1433        -2

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