Bump alpine from 3.18.2 to 3.19.1 in /docker

Bumps alpine from 3.18.2 to 3.19.1.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.18.2
+FROM alpine:3.19.1
 
 RUN apk add --no-cache gettext curl nginx php81 php81-fpm php81-opcache php81-pdo php81-pdo_sqlite php81-openssl && \
     mkdir /var/www/html