Bump pantheon-systems/wpunit-helpers from 1.0.1 to 2.0.0 (#457)

* Bump pantheon-systems/wpunit-helpers from 1.0.1 to 2.0.0

Bumps [pantheon-systems/wpunit-helpers](https://github.com/pantheon-systems/wpunit-helpers) from 1.0.1 to 2.0.0.
- [Release notes](https://github.com/pantheon-systems/wpunit-helpers/releases)
- [Commits](pantheon-systems/wpunit-helpers@v1.0.1...v2.0.0)

---
updated-dependencies:
- dependency-name: pantheon-systems/wpunit-helpers
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

* Tests require WP-CLI

---------

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

.github/workflows/lint-test.yml

@@ -83,6 +83,8 @@ jobs:
           path: ~/vendor
           key: test-dependencies-{{ checksum "composer.json" }}
           restore-keys: test-dependencies-{{ checksum "composer.json" }}
+      - name: Setup WP-CLI
+        uses: godaddy-wordpress/setup-wp-cli@1
       - name: Install dependencies
         run: |
           if [ ${{ matrix.php_version }} = "7.4" ]; then

composer.json

@@ -16,7 +16,7 @@
     "pantheon-systems/pantheon-wordpress-upstream-tests": "dev-master",
     "phpunit/phpunit": "^9",
     "yoast/phpunit-polyfills": "^2.0",
-    "pantheon-systems/wpunit-helpers": "^1.0"
+    "pantheon-systems/wpunit-helpers": "^2.0"
   },
   "scripts": {
     "lint": [