Build/Test Tools: Correct variable typo.

This was causing the version of WordPress being tested to be listed as `latest` even when that is not the case.

Props davidbaumwald.
See #58977.

git-svn-id: https://develop.svn.wordpress.org/trunk@56823 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/install-testing.yml

@@ -39,7 +39,7 @@ jobs:
   # - Creates a `wp-config.php` file.
   # - Installs WordPress.
   install-tests-mysql:
-    name: WP ${{ inputs.new-version || 'latest' }} / PHP ${{ matrix.php }} / ${{ 'mariadb' == matrix.db-type && 'MariaDB' || 'MySQL' }} ${{ matrix.db-version }}${{ matrix.multisite && ' multisite' || '' }}
+    name: WP ${{ inputs.wp-version || 'latest' }} / PHP ${{ matrix.php }} / ${{ 'mariadb' == matrix.db-type && 'MariaDB' || 'MySQL' }} ${{ matrix.db-version }}${{ matrix.multisite && ' multisite' || '' }}
     permissions:
       contents: read
     runs-on: ubuntu-latest