Bump click lower bound to >=8.4 and drop upper bound

[drusc0]

Summary

Bumps the click lower bound in the cli extra from ==8.* to >=8.4,<9, resolving to 8.4.1 in the lockfile (up from 8.2.1).

Refs #886

Notes on #886

The Error: No such option: -s in #886 is expected behavior — -s is not defined in the httpx2 CLI and no click version adds it automatically. The bump brings in error message formatting improvements and tuple-type option parsing fixes (type=(str, str) used by --params, --headers, --data, etc.).

Test plan

• scripts/lint passes
• scripts/test passes (full suite + 100% coverage)

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}

[codspeed-hq]

Merging this PR will not alter performance

✅ 15 untouched benchmarks
⏩ 7 skipped benchmarks¹

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_{Comparing drusc0:worktree-bright-nibbling-horizon (6ef78ab) with main (0dd0ee0)}

Footnotes

1. 7 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩