WP Super Cache: Minimum WP version is 6.6 again (#41465)

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/13110874125

Upstream-Ref: Automattic/jetpack@161a699

Author: dilirity

readme.txt

@@ -1,7 +1,7 @@
 === WP Super Cache ===
 Contributors: donncha, automattic, adnan007, dilirity, mikemayhem3030, pyronaur, thingalon
 Tags: performance, caching, wp-cache, wp-super-cache, cache
-Requires at least: 6.2
+Requires at least: 6.6
 Requires PHP: 7.2
 Tested up to: 6.7.1
 Stable tag: 2.0.0