Update dependency wpackagist-plugin/wp-super-cache to v1.9.2

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/wp-super-cache (source)	require	patch	1.9.1 -> 1.9.2

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This MR has been generated by Renovate Bot.

mentioned in issue #41

merged

mentioned in commit 8c3f9001