Bump alpine from 3.18.2 to 3.18.3

Bumps alpine from 3.18.2 to 3.18.3.

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

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

Dockerfile

@@ -10,7 +10,7 @@ WORKDIR /gitvote/src
 RUN cargo build --release
 
 # Final stage
-FROM alpine:3.18.2
+FROM alpine:3.18.3
 RUN apk --no-cache add ca-certificates && addgroup -S gitvote && adduser -S gitvote -G gitvote
 USER gitvote
 WORKDIR /home/gitvote