Merge pull request #944 from nginx-proxy/dependabot/docker/alpine-3.15.4

chore(deps): Bump alpine from 3.15.3 to 3.15.4

Author: buchdag

Dockerfile

@@ -1,6 +1,6 @@
 FROM nginxproxy/docker-gen:0.8.4 AS docker-gen
 
-FROM alpine:3.15.3
+FROM alpine:3.15.4
 
 ARG GIT_DESCRIBE
 ARG ACMESH_VERSION=2.9.0