Build/Test Tools: Fix the Performance workflow in the 6.4 branch.

This pins the `LOCAL_PHP` version to 8.2 in the Performance workflow to ensure that the base measurements taken from WordPress version 6.1.1 can be run, since PHP 8.2 is the greatest version that WordPress 6.1.1 supports.

The default PHP version used in the 6.4 branch was bumped to 8.3 in [57198] to reflect the highest version that WordPress 6.4 supports, resulting in the failures to the Performance workflow.

Props joemcgill, freewebmentor, desrosj, swissspidy.
Fixes #60127.


git-svn-id: https://develop.svn.wordpress.org/branches/6.4@58272 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/performance.yml

@@ -37,6 +37,7 @@ env:
   LOCAL_SCRIPT_DEBUG: false
   LOCAL_SAVEQUERIES: false
   LOCAL_WP_DEVELOPMENT_MODE: "''"
+  LOCAL_PHP: "8.2-fpm"
 
   # This workflow takes two sets of measurements — one for the current commit,
   # and another against a consistent version that is used as a baseline measurement.