Updates colindean/diff-poetry-lock action to v0.0.2

Updated the diff-poetry-lock action to a specific commit.

Author: colindean

.github/workflows/poetry-checks.yml

@@ -26,5 +26,5 @@ jobs:
         persist-credentials: false
     # This will post a comment on PRs when poetry.lock changes
     - name: Diff poetry.lock
-      uses: colindean/diff-poetry-lock@nl
+      uses: colindean/diff-poetry-lock@30a153ca2d5cbdd209fc78b0ec013915748b6bab # v0.0.2