Bump bpmn-js from 18.9.1 to 18.12.0

Bumps [bpmn-js](https://github.com/bpmn-io/bpmn-js) from 18.9.1 to 18.12.0.
- [Release notes](https://github.com/bpmn-io/bpmn-js/releases)
- [Changelog](https://github.com/bpmn-io/bpmn-js/blob/develop/CHANGELOG.md)
- [Commits](bpmn-io/bpmn-js@v18.9.1...v18.12.0)

---
updated-dependencies:
- dependency-name: bpmn-js
  dependency-version: 18.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -19,7 +19,7 @@
     "@docusaurus/core": "3.9.2",
     "@docusaurus/preset-classic": "3.9.2",
     "@mdx-js/react": "^3.1.1",
-    "bpmn-js": "^18.9.1",
+    "bpmn-js": "^18.12.0",
     "clsx": "^2.1.1",
     "docusaurus-theme-search-typesense": "^0.26.0",
     "dotenv": "^17.2.4",