Bump @tootallnate/once and @vscode/test-electron (#319)

Removes [@tootallnate/once](https://github.com/TooTallNate/once). It's no longer used after updating ancestor dependency [@vscode/test-electron](https://github.com/Microsoft/vscode-test). These dependencies need to be updated together.


Removes `@tootallnate/once`

Updates `@vscode/test-electron` from 2.3.8 to 2.5.2
- [Changelog](https://github.com/microsoft/vscode-test/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Microsoft/vscode-test/commits/v2.5.2)

---
updated-dependencies:
- dependency-name: "@tootallnate/once"
  dependency-version: 
  dependency-type: indirect
- dependency-name: "@vscode/test-electron"
  dependency-version: 2.5.2
  dependency-type: direct:development
...

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Author: dependabot[bot]

package-lock.json

@@ -58,7 +58,7 @@
     "@types/mocha": "^9.0.0",
     "@types/node": "^20.14.0",
     "@types/vscode": "^1.109.0",
-    "@vscode/test-electron": "^2.3.8",
+    "@vscode/test-electron": "^2.5.2",
     "@vscode/test-web": "^0.0.71",
     "glob": "^7.1.6",
     "mocha": "^11.0.1",