Bump vscode-extension-tester from 8.11.0 to 8.16.0 (#1073)

* Bump vscode-extension-tester from 8.11.0 to 8.16.0

Bumps [vscode-extension-tester](https://github.com/redhat-developer/vscode-extension-tester/tree/HEAD/packages/extester) from 8.11.0 to 8.16.0.
- [Release notes](https://github.com/redhat-developer/vscode-extension-tester/releases)
- [Commits](https://github.com/redhat-developer/vscode-extension-tester/commits/v8.16.0/packages/extester)

---
updated-dependencies:
- dependency-name: vscode-extension-tester
  dependency-version: 8.16.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

* Add "WebWorker" as a lib for tsconfig.json

This should fix the compilation issues reported in selenium

Signed-off-by: David Thompson <[email protected]>

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Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: David Thompson <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: David Thompson <[email protected]>

Author: dependabot[bot]