Update actions/setup-node digest to 53b8394 (#473)

* Update actions/setup-node digest to 53b8394

* Update ssh-agent-build.yaml

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Gareth Healy <garethahealy@gmail.com>

Author: renovate[bot]

.github/workflows/ssh-agent-build.yaml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Set up Node.js
-        uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
         with:
           node-version: 24