Merge pull request jupyterhub#2751 from jupyterhub/dependabot/github_actions/nick-invision/retry-2.9.0

Bump nick-invision/retry from 2.8.3 to 2.9.0

Author: manics

.github/workflows/cd.yml

@@ -179,7 +179,7 @@ jobs:
 
       # Action Repo: https://github.com/nick-invision/retry
       - name: "Stage 4: Verify staging works"
-        uses: nick-invision/retry@943e742917ac94714d2f408a0e8320f2d1fcafcd
+        uses: nick-invision/retry@14672906e672a08bd6eeb15720e9ed3ce869cdd4
         with:
           timeout_minutes: 10
           max_attempts: 3
@@ -308,7 +308,7 @@ jobs:
           TERM: xterm
 
       - name: "Stage 4: Verify ${{ matrix.federation_member }} works"
-        uses: nick-invision/retry@943e742917ac94714d2f408a0e8320f2d1fcafcd
+        uses: nick-invision/retry@14672906e672a08bd6eeb15720e9ed3ce869cdd4
         with:
           timeout_minutes: 10
           max_attempts: 3