chore(deps): bump alpine from 3.18.3 to 3.18.4

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>

Dockerfile.alpine

@@ -12,7 +12,7 @@ RUN CGO_ENABLED=0 GOOS=linux go build \
 
 # ===
 
-FROM alpine:3.18.3
+FROM alpine:3.18.4
 
 RUN addgroup -S badrobot \
     && adduser -S -g badrobot badrobot \