chore(deps): bump @blockly/dev-tools from 8.0.12 to 9.0.0 (#9065)

Bumps [@blockly/dev-tools](https://github.com/google/blockly-samples/tree/HEAD/plugins/dev-tools) from 8.0.12 to 9.0.0.
- [Release notes](https://github.com/google/blockly-samples/releases)
- [Changelog](https://github.com/google/blockly-samples/blob/master/plugins/dev-tools/CHANGELOG.md)
- [Commits](https://github.com/google/blockly-samples/commits/@blockly/dev-tools@9.0.0/plugins/dev-tools)

---
updated-dependencies:
- dependency-name: "@blockly/dev-tools"
  dependency-version: 9.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -101,7 +101,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@blockly/block-test": "^6.0.4",
-    "@blockly/dev-tools": "^8.0.6",
+    "@blockly/dev-tools": "^9.0.0",
     "@blockly/theme-modern": "^6.0.3",
     "@hyperjump/browser": "^1.1.4",
     "@hyperjump/json-schema": "^1.5.0",