🐛 Fixing parsing errors for github workflows

[ristomcgehee]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• PR title follows the guidelines defined in https://github.com/ossf/scorecard/blob/main/CONTRIBUTING.md#pr-process

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Bug fix

• What is the current behavior? (You can also link to an open issue here)
  Pinned dependency check fails when non-yaml files are present in .github/workflows. This will fix some of the repos Azeem mentioned in BUG: Parsing errors #839 (comment). I had these lines originally in 🐛 Parsing GitHub Workflows should only happen on yaml files #970, but they were removed in a later PR, most likely inadvertently (merging is hard).

• What is the new behavior (if this is a feature change)?
  The check for unpinned actions will skip non-yaml files.

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No

[naveensrinivasan]

Thank you @chrismcgehee !

[azeemshaikh38]

Thanks!