Update *.git.wordpress.org to rename `master` to `trunk`.

WordPress CoreCore Core is the set of software required to run WordPress. The Core Development Team builds WordPress. has decided to rename from master to trunk on all repo’s: https://make.wordpress.org/core/2020/06/18/proposal-update-all-git-repositories-to-use-main-instead-of-master/ and Gutenberg did that over here: https://github.com/WordPress/gutenberg/issues/27741

This is primarily for https://github.com/wordpress/wordpress/ & https://github.com/wordpress/wordpress-develop/ ( core.git.wordpress.org & develop.git.wordpress.org) but could also be applied to all of the git mirrors for simplicity.

The full list of *.git.wordpress.orgWordPress.org The community site where WordPress code is created and shared by the users. This is where you can download the source code for WordPress core, plugins and themes as well as the central location for community conversations and organization. https://wordpress.org/ mirrors are the following AFAIK, and all can be updated without issue, as all the projects listed will just follow core’s direction here. I don’t know how this will affect the *.git => githubGitHub GitHub is a website that offers online implementation of git repositories that can can easily be shared, copied and modified by other developers. Public repositories are free to host, private repositories require a paid subscription. GitHub introduced the concept of the ‘pull request’ where code changes done in branches by contributors can be reviewed and discussed before being merged be the repository owner. https://github.com/ syncing process and/or what will need to change on GitHub.
– core.git.wordpress.org
– develop.git.wordpress.org
– backpress.git.wordpress.org
– bbpress.git.wordpress.org
– buddypress.git.wordpress.org
– glotpress.git.wordpress.org
– meta.git.wordpress.org

Can we make the change to our git mirrors please?

Requested via https://wordpress.slack.com/archives/C02QB8GMM/p1614648674097800

cc @noisysocks @jorbin

#prio2