deps: bump bpmn-js from 14.2.0 to 15.0.0

Bumps [bpmn-js](https://github.com/bpmn-io/bpmn-js) from 14.2.0 to 15.0.0.
- [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@v14.2.0...v15.0.0)

---
updated-dependencies:
- dependency-name: bpmn-js
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -20,7 +20,7 @@
   "author": "Nico Rehwaldt<git_nikku@nixis.de>",
   "license": "MIT",
   "devDependencies": {
-    "bpmn-js": "^14.2.0",
+    "bpmn-js": "^15.0.0",
     "chai": "^4.3.0",
     "eslint": "^7.21.0",
     "eslint-plugin-bpmn-io": "^0.12.0",