chore(deps): update dependency mlocati/docker-php-extension-installer to v2.9.0 (#483)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

web/Dockerfile

@@ -4,7 +4,7 @@ LABEL maintainer="[email protected]"
 LABEL vendor="https://github.com/jeboehm/docker-mailserver"
 LABEL de.ressourcenkonflikt.docker-mailserver.autoheal="true"
 
-ARG EXTENSION_INSTALLER_VER=2.8.6 # renovate: depName=mlocati/docker-php-extension-installer
+ARG EXTENSION_INSTALLER_VER=2.9.0 # renovate: depName=mlocati/docker-php-extension-installer
 RUN curl -sSLf \
         -o /usr/local/bin/install-php-extensions \
         https://github.com/mlocati/docker-php-extension-installer/releases/download/${EXTENSION_INSTALLER_VER}/install-php-extensions && \