chore(deps): pin dependencies

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

Author: renovate[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Install dependencies
-FROM composer:2 AS composer_build
+FROM composer:2@sha256:f0809732b2188154b3faa8e44ab900595acb0b09cd0aa6c34e798efe4ebc9021 AS composer_build
 
 WORKDIR /app
 
@@ -17,7 +17,7 @@ RUN composer install \
     --ignore-platform-reqs
 
 # Stage 2: Final image
-FROM dunglas/frankenphp:latest
+FROM dunglas/frankenphp:latest@sha256:d3c991a312bcb343e1385be577f3ea75f509feaaf176f721313f7dd48cee0fdd
 
 # Disable HTTPS by default for the container
 ENV SERVER_NAME=:80