Add Twenty Twenty-five to Performance Tests

[pbearne]

Changed the default value of the baseline version from 6.1.1 to 6.6.2 in the reusable-performance.yml workflow file. This ensures the workflow uses the latest baseline version for performance measurements.

Trac ticket: https://core.trac.wordpress.org/ticket/62148

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[felixarntz]

I wonder whether we should bump this to 6.7 instead, now that it's out? Since we're early in the release cycle, maybe now would be a good time for such a change, as we're not yet in the critical phase where likely more changes land that may impact performance.

[joemcgill]

I wonder whether we should bump this to 6.7 instead, now that it's out?

I think we should give this a try. We've not updated the baseline version since the performance tests were first introduced, so now would be a good time to try this prior to any code syncs being merged into the core repo for this release.