Tweak Dependabot schedule and update rules

Change Dependabot update cadence from daily to weekly, and add a 7-day cooldown for semver-minor and semver-patch updates to reduce churn. Also update the global ignore rule to skip semver-major updates (previously it was ignoring semver-patch), so major updates are not opened as PRs by Dependabot.

Author: gemcoder21

.github/dependabot.yml

@@ -15,11 +15,14 @@ updates:
     directory: "/core"
     open-pull-requests-limit: 2
     schedule:
-      interval: "daily"
+      interval: "weekly"
+    cooldown:
+      semver-minor-days: 7
+      semver-patch-days: 7
     ignore:
       - dependency-name: "*"
         update-types:
-          - "version-update:semver-patch"
+          - "version-update:semver-major"
 
   - package-ecosystem: "github-actions"
     directory: "/"