Update dependency wpackagist-plugin/wp-super-cache to v1.9.4

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/wp-super-cache (source)	require	patch	1.9.3 -> 1.9.4

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composer.json

@@ -48,7 +48,7 @@
         "wpackagist-plugin/disable-wordpress-updates": "1.7.1",
         "wpackagist-plugin/more-privacy-options": "4.6",
         "wpackagist-plugin/disable-emojis": "1.7.4",
-        "wpackagist-plugin/wp-super-cache": "1.9.3",
+        "wpackagist-plugin/wp-super-cache": "1.9.4",
         "wpackagist-plugin/wp-piwik": "1.0.27",
         "wpackagist-plugin/wp-syntax": "1.1",
         "wpackagist-theme/azul": "1.51",