switch qtkeychain repository to mainline

[nschimme]

Wasm support was merged into mainline

Summary by Sourcery

Build:

• Update qtkeychain ExternalProject configuration to point to the mainline repository at a fixed revision instead of a forked wasm branch.

[sourcery-ai]

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a brief comment in the CMake file explaining why qtkeychain is pinned to this specific commit hash so future maintainers understand the rationale for not tracking a tag or release.
• If qtkeychain publishes stable tags (e.g., release tags), consider pinning to a tag instead of a raw commit hash to make future updates and audits of third-party dependencies easier.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a brief comment in the CMake file explaining why qtkeychain is pinned to this specific commit hash so future maintainers understand the rationale for not tracking a tag or release.
- If qtkeychain publishes stable tags (e.g., release tags), consider pinning to a tag instead of a raw commit hash to make future updates and audits of third-party dependencies easier.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.36%. Comparing base (df720b1) to head (ef4b024).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #529   +/-   ##
=======================================
  Coverage   25.36%   25.36%           
=======================================
  Files         519      519           
  Lines       43181    43181           
  Branches     4704     4705    +1     
=======================================
  Hits        10952    10952           
  Misses      32229    32229           

☔ View full report in Codecov by Sentry.
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