chore(deps): update php docker tag to v8.1.12

This MR contains the following updates:

Package	Type	Update	Change
php	final	patch	8.1.11-apache-bullseye -> 8.1.12-apache-bullseye

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wp-docker/Dockerfile

-FROM php:8.1.11-apache-bullseye
+FROM php:8.1.12-apache-bullseye
 
 COPY install-php-extensions.sh .
 RUN chmod +x install-php-extensions.sh