github-actions: remove license check

[calebdoxsey]

Summary

Remove the license check.

Related issues

Fixes https://github.com/pomerium/internal/issues/1482

Checklist

• reference any related issues
• updated docs
• updated unit tests
• updated UPGRADING.md
• add appropriate tag (improvement / bug / etc)
• ready for review

[coveralls]

coverage: 63.676% (+0.03%) from 63.649% when pulling 7f3f6f6 on cdoxsey/remove-fossa into 34259b9 on main.

[backport-actions-token]

The backport to 0-22-0 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-0-22-0 0-22-0
# Navigate to the new working tree
cd .worktrees/backport-0-22-0
# Create a new branch
git switch --create backport-4434-to-0-22-0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 1c6026ba413bb50728c525aa579e5e5571aa17ed
# Push it to GitHub
git push --set-upstream origin backport-4434-to-0-22-0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-0-22-0

Then, create a pull request where the base branch is 0-22-0 and the compare/head branch is backport-4434-to-0-22-0.