chore(deps-dev): bump vscode-extension-tester from 5.3.0 to 5.6.0

Bumps [vscode-extension-tester](https://github.com/redhat-developer/vscode-extension-tester) from 5.3.0 to 5.6.0.
- [Changelog](https://github.com/redhat-developer/vscode-extension-tester/blob/main/CHANGELOG.md)
- [Commits](redhat-developer/vscode-extension-tester@v5.3.0...v5.6.0)

---
updated-dependencies:
- dependency-name: vscode-extension-tester
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -768,7 +768,7 @@
     "prettier": "^2.8.8",
     "ts-loader": "^9.4.2",
     "typescript": "^5.0.4",
-    "vscode-extension-tester": "^5.3.0",
+    "vscode-extension-tester": "^5.6.0",
     "vscode-tmgrammar-test": "^0.1.1",
     "webpack": "^5.83.1",
     "webpack-cli": "^5.0.1"