chore(deps): bump simple-git and @wordpress/env in /tests/pw (#2038)

Bumps [simple-git](https://github.com/steveukx/git-js/tree/HEAD/simple-git) to 3.20.0 and updates ancestor dependency [@wordpress/env](https://github.com/WordPress/gutenberg/tree/HEAD/packages/env). These dependencies need to be updated together.


Updates `simple-git` from 2.48.0 to 3.20.0
- [Release notes](https://github.com/steveukx/git-js/releases)
- [Changelog](https://github.com/steveukx/git-js/blob/main/simple-git/CHANGELOG.md)
- [Commits](https://github.com/steveukx/git-js/commits/[email protected]/simple-git)

Updates `@wordpress/env` from 4.2.1 to 4.9.0
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/env/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/[email protected]/packages/env)

---
updated-dependencies:
- dependency-name: simple-git
  dependency-type: indirect
- dependency-name: "@wordpress/env"
  dependency-type: direct:production
...

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

tests/pw/package.json

@@ -61,7 +61,7 @@
     "dependencies": {
         "@faker-js/faker": "^8.0.2",
         "@playwright/test": "^1.38.1",
-        "@wordpress/env": "^4.2.1",
+        "@wordpress/env": "^4.9.0",
         "allure-playwright": "^2.7.0",
         "dotenv": "^16.3.1",
         "mysqlconnector": "^2.0.1",