chore: upgrade Mintlify from v4.0.436 to v4.2.87 (calcom#23418)

- Updated GitHub Actions workflow to use latest stable Mintlify version
- Tested local build compatibility with existing mint.json configuration
- Verified no breaking changes or type errors introduced
- Both mint.json and docs.json configurations supported in new version

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: ali@cal.com <ali@cal.com>
Co-authored-by: Syed Ali Shahbaz <52925846+alishaz-polymath@users.noreply.github.com>

Author: 3 people

.github/workflows/docs-build.yml

@@ -35,7 +35,7 @@ jobs:
         working-directory: docs
         run: |
           export NODE_OPTIONS="--max_old_space_size=8192"
-          npm install -g mintlify@4.0.436
+          npm install -g mintlify@4.2.87
           mintlify dev &
           sleep 5 # Let it run for 5 seconds
           kill $!