Dependabot: Ignore patch level updates

Keeping them constantly updated has limited benefits while it annoys the maintainers. In the ~2.5
months Dependabot has been enabled it filed 44 PRs. With this configuration, it would have only
filed 4 PRs.

Author: LingMan

.github/dependabot.yml

@@ -5,6 +5,9 @@ updates:
     schedule:
       interval: "weekly"
     open-pull-requests-limit: 20
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"]
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule: