Update command used by Dependabot to update NOTICE files (#5001) (#5005)

(cherry picked from commit 1658247)

Co-authored-by: Shaunak Kashyap <ycombinator@gmail.com>

Author: mergify[bot]

.github/workflows/post-dependabot.yml

@@ -22,8 +22,12 @@ jobs:
         with:
           go-version-file: .go-version
 
-      - name: update NOTICE.txt
-        run: make notice
+      - uses: magefile/mage-action@v3
+        with:
+          install-only: true
+
+      - name: update NOTICE.txt and NOTICE-FIPS.txt
+        run: mage check:notice
 
       - name: run go mod tidy in testing/
         run: cd testing; go mod tidy