Ignore unapproved GitHub Actions versions (#101)

- actions/setup-node >= 6.2.0
- actions/setup-python >= 6.1.0

These versions are not yet on the enterprise approved actions allowlist.

Author: mraible

.github/dependabot.yml

@@ -16,3 +16,8 @@ updates:
       day: "monday"
       time: "14:00"
       timezone: "UTC"
+    ignore:
+      - dependency-name: "actions/setup-node"
+        versions: [">=6.2.0"]
+      - dependency-name: "actions/setup-python"
+        versions: [">=6.1.0"]