chore(deps): bump @blockly/theme-modern from 5.0.5 to 6.0.2

Bumps [@blockly/theme-modern](https://github.com/google/blockly-samples/tree/HEAD/plugins/theme-modern) from 5.0.5 to 6.0.2.
- [Release notes](https://github.com/google/blockly-samples/releases)
- [Changelog](https://github.com/google/blockly-samples/blob/master/plugins/theme-modern/CHANGELOG.md)
- [Commits](https://github.com/google/blockly-samples/commits/@blockly/theme-modern@6.0.2/plugins/theme-modern)

---
updated-dependencies:
- dependency-name: "@blockly/theme-modern"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -102,7 +102,7 @@
   "devDependencies": {
     "@blockly/block-test": "^5.0.0",
     "@blockly/dev-tools": "^7.0.2",
-    "@blockly/theme-modern": "^5.0.0",
+    "@blockly/theme-modern": "^6.0.2",
     "@hyperjump/json-schema": "^1.5.0",
     "@microsoft/api-documenter": "^7.22.4",
     "@microsoft/api-extractor": "^7.29.5",