Update dependency wpackagist-plugin/wp-super-cache to v2

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/wp-super-cache (source)	require	major	1.12.4 -> 2.0.0

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composer.json

@@ -45,7 +45,7 @@
         "wpackagist-plugin/disable-wordpress-updates": "1.8.0",
         "wpackagist-plugin/more-privacy-options": "4.6",
         "wpackagist-plugin/disable-emojis": "1.7.6",
-        "wpackagist-plugin/wp-super-cache": "1.12.4",
+        "wpackagist-plugin/wp-super-cache": "2.0.0",
         "wpackagist-plugin/wp-piwik": "1.0.30",
         "wpackagist-plugin/wp-syntax": "1.2",
         "wpackagist-theme/azul": "1.51",