chore(dependabot): pin marked to <16 to keep peer compat with marked-terminal

marked-terminal@7.3.0 requires peer marked@">=1 <16". Ignore semver-major
bumps for marked until marked-terminal supports a newer range.

Author: delexw

.github/dependabot.yml

@@ -4,6 +4,9 @@ updates:
     directory: /
     schedule:
       interval: weekly
+    ignore:
+      - dependency-name: "marked"
+        update-types: ["version-update:semver-major"]
     groups:
       dev-dependencies:
         dependency-type: development