Build/Test Tools: Use correct tag name for the baseline version.

The tagged version on GitHub requires the trailing `.0`.

See #62148.

git-svn-id: https://develop.svn.wordpress.org/trunk@59525 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/reusable-performance.yml

@@ -15,7 +15,7 @@ on:
         description: 'The version being used for baseline measurements.'
         required: false
         type: 'string'
-        default: '6.7'
+        default: '6.7.0'
       php-version:
         description: 'The PHP version to use.'
         required: false