Build/Test Tools: Bump baseline version for performance testing.

This ensures that the the performance testing workflow is providing meaningful data to track performance regressions and improvements.

Props mukesh27.
Fixes #65289.

git-svn-id: https://develop.svn.wordpress.org/trunk@62402 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/reusable-performance-test-v2.yml

@@ -19,7 +19,7 @@ on:
         description: 'The version being used for baseline measurements.'
         required: false
         type: 'string'
-        default: '6.7.0'
+        default: '7.0.0'
       TARGET_SHA:
         description: 'SHA hash of the target commit used for "before" measurements.'
         required: true