Change Dependabot to quarterly updates (#34)

* Change Dependabot to quarterly updates

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nstarman <8949649+nstarman@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -4,7 +4,7 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "monthly"
+      interval: "quarterly"
     labels:
       - "dependencies"
       - "github-actions"