chore: bump golang to 1.27.1

[zhaohuabing]

Bumps the Go toolchain to 1.27.1 across all go.mod files and the pinned golang builder image in the example Dockerfiles.

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[chatgpt-codex-connector]

💡 Codex Review

https://github.com/envoyproxy/gateway/blob/30455ef665e490fe3ac876408cc8c3b15c29f95c/tools/benchmark-dashboard-sync#L1
Remove the checked-in host binary

This version-only change also adds a 9.8 MB Mach-O arm64 executable built from tools/src/benchmark-dashboard-sync, including host-specific /Users/... build paths. It is an opaque local build artifact that cannot run on Linux CI or most contributor machines, permanently bloats every clone, and duplicates the supported source-based entry point in tools/src/benchmark-dashboard-sync/sync.sh; remove it from the commit and consider ignoring the output path.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.30%. Comparing base (3cb03be) to head (30455ef).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9939      +/-   ##
==========================================
- Coverage   81.31%   81.30%   -0.02%     
==========================================
  Files         263      263              
  Lines       40870    40870              
==========================================
- Hits        33233    33228       -5     
- Misses       7637     7642       +5     

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