Update dependabot.yml configuration (#684)

Ignore major version package updates in the dependabot configuration in both default and tools composer.json files.

Author: jasonhebert

.github/dependabot.yml

@@ -4,9 +4,14 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]
   - package-ecosystem: "composer"
     directory: "/tools"
     schedule:
       interval: "daily"
     ignore:
-      - dependency-name: "rector/rector"
+      - dependency-name: "rector/rector"
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]