build(deps): bump alpine from 3.17 to 3.18

Bumps alpine from 3.17 to 3.18.

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

Signed-off-by: dependabot[bot] <[email protected]>

Dockerfile

@@ -8,7 +8,7 @@ COPY . /build/
 RUN make
 
 # runtime image
-FROM alpine:3.17
+FROM alpine:3.18
 RUN apk add --no-cache ca-certificates
 # set up nsswitch.conf for Go's "netgo" implementation
 # - https://github.com/docker-library/golang/blob/1eb096131592bcbc90aa3b97471811c798a93573/1.14/alpine3.12/Dockerfile#L9