I’m not sure about updating this GitHub action. Is .github/workflows/configlet-generate.yml provided centrally by Exercism or part of the individual track tooling?
stefanzweifel/git-auto-commit-action suggests to ensure, that auto-commit happens to the source branch and not to a possibly outdated commit id by adding configuration to the actions/checkout workflow.
See the second code block of the README. There may be other issues as suggested further down the README.