Bump alpine from 3.17.3 to 3.19.1 in /cmd (#115)

* Bump alpine from 3.17.3 to 3.19.1 in /cmd

Bumps alpine from 3.17.3 to 3.19.1.

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

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

* Pin it with a hash

* Actual sha256

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Martin Hutchinson <mhutchinson@gmail.com>

cmd/Dockerfile

@@ -18,7 +18,7 @@ COPY . .
 RUN go build -o bin/distributor ./cmd
 
 # Build release image
-FROM alpine:3.17.3
+FROM alpine:3.19.1@sha256:c5b1261d6d3e43071626931fc004f70149baeba2c8ec672bd4f27761f8e1ad6b
 
 COPY --from=builder /build/bin/distributor /bin/distributor
 ENTRYPOINT ["/bin/distributor"]