build(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

@@ -32,13 +32,13 @@ COPY . .
 RUN make release-binary
 RUN xx-verify /go/bin/dex && xx-verify /go/bin/docker-entrypoint
 
-FROM alpine:3.18.3 AS stager
+FROM alpine:3.18.4 AS stager
 
 RUN mkdir -p /var/dex
 RUN mkdir -p /etc/dex
 COPY config.docker.yaml /etc/dex/
 
-FROM alpine:3.18.3 AS gomplate
+FROM alpine:3.18.4 AS gomplate
 
 ARG TARGETOS
 ARG TARGETARCH
@@ -51,7 +51,7 @@ RUN wget -O /usr/local/bin/gomplate \
   && chmod +x /usr/local/bin/gomplate
 
 # For Dependabot to detect base image versions
-FROM alpine:3.18.3 AS alpine
+FROM alpine:3.18.4 AS alpine
 FROM gcr.io/distroless/static:latest AS distroless
 
 FROM $BASE_IMAGE