chore(deps): update php docker tag to v8.4.20 (#803)

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

Author: renovate[bot]

renovate.Dockerfile

@@ -20,4 +20,4 @@ ENV PHP_VERSION=8.3.30
 
 # EOL: 2028-12-31
 # renovate: datasource=docker depName=php versioning=docker
-ENV PHP_VERSION=8.4.19
+ENV PHP_VERSION=8.4.20