[release-1.20] Update golang toolchain

[github-actions]

🤖 Automated backport of #2018 to release-1.20

⚠️ This PR has merge conflicts that need manual resolution.

Original PR: #2018
Original Author: @henry118

Cherry-picked commits (3):

• a1f8e3a Update minimum go toolchain to 1.26
• 234c295 Fix linting issues after golang update
• 7c30ede Bump CI golang version to 1.27

Next Steps:

1. Review the conflicts in the "Files changed" tab
2. Check out this branch locally: git fetch origin backport-2018-to-release-1.20 && git checkout backport-2018-to-release-1.20
3. Resolve conflicts manually
4. Push the resolution: git push --force-with-lease origin backport-2018-to-release-1.20

---

Instructions for resolving conflicts

git fetch origin backport-2018-to-release-1.20
git checkout backport-2018-to-release-1.20
# Resolve conflicts in your editor
git add .
git commit
git push --force-with-lease origin backport-2018-to-release-1.20

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