Force the push to the docs branch

[yanokwa]

Build failure at https://github.com/getodk/pyodk/actions/runs/4615333206/jobs/8159111521.

To https://github.com/getodk/pyodk
 ! [rejected]        gh-pages -> gh-pages (fetch first)
error: failed to push some refs to 'https://github.com/getodk/pyodk'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

Found solution at https://squidfunk.github.io/mkdocs-material/publishing-your-site