bump go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/m…

[MinerYang]

…ux/otelmux

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Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

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• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

Merging #19476 (29d406d) into release-2.9.0 (dbcf60e) will increase coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           release-2.9.0   #19476      +/-   ##
=================================================
+ Coverage          67.40%   67.42%   +0.01%     
=================================================
  Files                993      993              
  Lines             108932   108932              
  Branches            2752     2752              
=================================================
+ Hits               73430    73450      +20     
+ Misses             31550    31526      -24     
- Partials            3952     3956       +4     

Flag	Coverage Δ
unittests	67.42% <ø> (+0.01%)	⬆️

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see 9 files with indirect coverage changes