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

@@ -2,7 +2,7 @@ FROM docker.io/golang:1.21.1 AS builder
 COPY . src
 RUN cd src && make build
 
-FROM docker.io/alpine:3.18.3
+FROM docker.io/alpine:3.18.4
 LABEL maintainer="Dalton Hubble <dghubble@gmail.com>"
 LABEL org.opencontainers.image.title="fleetlock",
 LABEL org.opencontainers.image.source="https://github.com/poseidon/fleetlock"