chore: manage dependabot config via Terraform

Author: gcp-atlantis[bot]

.github/dependabot.yml

@@ -1,10 +1,12 @@
-version: 2
-updates:
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "daily"
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
+"updates":
+- "directory": "/"
+  "open-pull-requests-limit": 5
+  "package-ecosystem": "gomod"
+  "schedule":
+    "interval": "daily"
+- "directory": "/"
+  "open-pull-requests-limit": 5
+  "package-ecosystem": "github-actions"
+  "schedule":
+    "interval": "daily"
+"version": 2