Group oxc dependencies in Dependabot configuration (#127)

* chore: group oxlint and oxfmt dependabot updates under oxc group

* chore: remove incorrect @oxlint/* pattern from dependabot group

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Co-authored-by: Claude <noreply@anthropic.com>

Author: bartveneman

.github/dependabot.yml

@@ -7,6 +7,11 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
+    groups:
+      oxc:
+        patterns:
+          - 'oxlint'
+          - 'oxfmt'
   - package-ecosystem: 'github-actions'
     directory: '/'
     schedule: