Removing Github action vulnerability

Author: emmaeturner

.github/workflows/type-check.yml

@@ -15,7 +15,7 @@ jobs:
           python-version: "3.10"
       - name: Get changed files
         id: changed-files
-        uses: tj-actions/changed-files@v45
+        uses: step-security/changed-files@45
         with:
           files: |
             src/**/*.py