build(deps): bump alpine from 3.18.3 to 3.18.4 in /darkhttpd

Bumps alpine from 3.18.3 to 3.18.4.

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

Signed-off-by: dependabot[bot] <support@github.com>

darkhttpd/Dockerfile

@@ -4,7 +4,7 @@
 # https://github.com/emikulic/darkhttpd
 
 # Build environment
-FROM alpine:3.18.3 AS build 
+FROM alpine:3.18.4 AS build 
 
 RUN apk add --no-cache \
   build-base=~0.5