Bump vscode-extension-tester in the development-dependencies group (#1935)

Bumps the development-dependencies group with 1 update: [vscode-extension-tester](https://github.com/redhat-developer/vscode-extension-tester/tree/HEAD/packages/extester).


Updates `vscode-extension-tester` from 8.10.0 to 8.11.0
- [Release notes](https://github.com/redhat-developer/vscode-extension-tester/releases)
- [Commits](https://github.com/redhat-developer/vscode-extension-tester/commits/v8.11.0/packages/extester)

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

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

Author: dependabot[bot]