fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN13-LIBXML2-12484642
- https://snyk.io/vuln/SNYK-DEBIAN13-CURL-12613264
- https://snyk.io/vuln/SNYK-DEBIAN13-CURL-12613266
- https://snyk.io/vuln/SNYK-DEBIAN13-CURL-13833317
- https://snyk.io/vuln/SNYK-DEBIAN13-CURL-13833317

Author: snyk-bot

Dockerfile

@@ -4,7 +4,7 @@
 #
 
 # Stage 1: Composer dependencies with PHP extensions
-FROM php:8.5.0RC2-cli AS composer
+FROM php:8.5.0RC5-cli AS composer
 
 RUN apt-get update && apt-get install -y \
     git unzip libpng-dev libjpeg-dev libfreetype6-dev libzip-dev libicu-dev libpq-dev libldap2-dev libbz2-dev libsodium-dev \
@@ -22,7 +22,7 @@ COPY composer.json composer.lock ./
 RUN composer install --no-interaction --prefer-dist --optimize-autoloader --verbose
 
 # Stage 2: PHP runtime with same extensions
-FROM php:8.5.0RC2-cli
+FROM php:8.5.0RC5-cli
 
 # Install necessary system dependencies again (clean stage)
 RUN apt-get update && apt-get install -y \