Pin codecov/codecov-action to v7.0.0 (GHO-261)

Author: sayo-ep

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
         run: EASYPOST_TEST_API_KEY=123 EASYPOST_PROD_API_KEY=123 just coverage
       - name: Coverage
         if: github.ref == 'refs/heads/master'
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
       - name: Run security analysis