build: bump alpine from 3.19.1 to 3.20.0

Bumps alpine from 3.19.1 to 3.20.0.

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

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

Author: dependabot[bot]

Dockerfile

@@ -1,6 +1,6 @@
 FROM nginxproxy/docker-gen:0.13.1 AS docker-gen
 
-FROM alpine:3.19.1
+FROM alpine:3.20.0
 
 ARG GIT_DESCRIBE="unknown"
 ARG ACMESH_VERSION=3.0.7