[dependabot] Group cairo lang updates (#34)

<!-- Reference any GitHub issues resolved by this PR -->

Closes #

## Introduced changes

<!-- A brief description of the changes -->

- Groups cairo-lang-* packages with each other for dependabot updates

## Checklist

<!-- Make sure all of these are complete -->

- [ ] Linked relevant issue
- [ ] Updated relevant documentation
- [ ] Added relevant tests
- [ ] Performed self-review of the code
- [ ] Added changes to `CHANGELOG.md`

.github/dependabot.yml

@@ -4,6 +4,13 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+    groups:
+      regular:
+        exclude-patterns:
+          - "cairo-lang-*"
+      cairo-lang:
+        patterns:
+          - "cairo-lang-*"
 
   - package-ecosystem: "github-actions"
     directory: "/"