[llvm] [GitHub] Fix minor typos in .github/workflows (PR #76592)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM. Did you  find these issues by manual inspection or with some automated tooling?

I wouldn't mind having enforced linting/formatting on the Github actions yaml files to ensure consistent formatting, but not sure how necessary that is.

https://github.com/llvm/llvm-project/pull/76592