update github author for commits, useful for older repos with inactive/non-github associated emails

fix.sh

# Preserves the date when updating all commits
git -c rebase.instructionFormat='%s%nexec GIT_COMMITTER_DATE="%cD" git commit --amend --no-edit --author "Your Name Goes Here <your-email@example.com>"' rebase -r --root

# Updates all commits from the current HEAD commit until the given commit hash
git rebase -r <commit> --exec 'git commit --amend --no-edit --author "Your Name Goes Here <your-email@example.com>"'

# You can update all commits, use only if all the commits are your own!
# git rebase -r --root --exec 'git commit --amend --no-edit --author "Your Name Goes Here <your-email@example.com>"'

# Source: https://stackoverflow.com/a/75841127