Update matomo Docker tag to v5.1.2

This MR contains the following updates:

Package	Type	Update	Change
matomo		patch	5.1.1 -> 5.1.2
matomo	ironbank-docker	patch	5.1.1-fpm -> 5.1.2-fpm
matomo	stage	patch	5.1.1-fpm -> 5.1.2-fpm

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