Switch all main branches for the bundled packages from master to main.

⚠️ However, this will cause all open PRs to become invalid and immediately be closed! ⚠️

Therefore, this should be worked upon for each repo separately, while first ensuring no PRs are open against the master branch anymore.

Note: The Composer branch-alias needs to be adapted to change from dev-master to dev-main as well. Additionally, wp-cli-dev will need its composer.json file updated.

After the changes, the following commands can adapt a local repository for the same change:

git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

TODO:

• wp-cli/admin-command
• wp-cli/wp-cli-bundle
• wp-cli/cache-command
• wp-cli/checksum-command
• wp-cli/config-command
• wp-cli/core-command
• wp-cli/cron-command
• wp-cli/db-command
• wp-cli/embed-command
• wp-cli/entity-command
• wp-cli/eval-command
• wp-cli/export-command
• wp-cli/extension-command
• wp-cli/i18n-command
• wp-cli/import-command
• wp-cli/language-command
• wp-cli/maintenance-mode-command
• wp-cli/media-command
• wp-cli/package-command
• wp-cli/rewrite-command
• wp-cli/restful
• wp-cli/role-command
• wp-cli/scaffold-command
• wp-cli/scaffold-package-command
• wp-cli/search-replace-command
• wp-cli/server-command
• wp-cli/shell-command
• wp-cli/super-admin-command
• wp-cli/widget-command
• wp-cli/wp-cli
• wp-cli/wp-cli-tests
• wp-cli/doctor-command
• wp-cli/profile-command
• wp-cli/handbook
• wp-cli/wp-cli.github.com