feat: require Go >= 1.21

[jooola]

This is required for us to use the maps stdlib.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.43%. Comparing base (575c24c) to head (8f52466).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #424   +/-   ##
=======================================
  Coverage   80.43%   80.43%           
=======================================
  Files          33       33           
  Lines        5756     5756           
=======================================
  Hits         4630     4630           
  Misses        718      718           
  Partials      408      408           

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[github-actions]

The backport to release-1.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release-1.x release-1.x
# Navigate to the new working tree
cd .worktrees/backport-release-1.x
# Create a new branch
git switch --create backport-424-to-release-1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d4f40009016c3ed5bb14ef9ae16bcf6aefa90fee
# Push it to GitHub
git push --set-upstream origin backport-424-to-release-1.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-1.x

Then, create a pull request where the base branch is release-1.x and the compare/head branch is backport-424-to-release-1.x.