Tune dependabot crate config

For tokio only monitor major updates, for everything else only major and
minor updates

Signed-off-by: Sjoerd Simons <[email protected]>

Author: sjoerdsimons

.github/dependabot.yaml

@@ -16,3 +16,13 @@ updates:
       interval: "daily"
     labels:
       - "dependencies"
+       # Not yet supported. See <https://github.com/dependabot/dependabot-core/issues/4009>
+      # versioning-strategy: "increase-if-necessary"
+      ignore:
+        - dependency-name: "tokio"
+          update-types:
+            - "version-update:semver-minor"
+            - "version-update:semver-patch"
+        - dependency-name: "*"
+          update-types:
+            - "version-update:semver-patch"