Bump alpine from 3.19.1 to 3.20.3

Bumps alpine from 3.19.1 to 3.20.3.

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

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

Dockerfile

@@ -9,7 +9,7 @@ COPY . .
 RUN --mount=type=cache,target=/go/pkg/mod --mount=type=cache,target=/root/.cache/go-build GOMODCACHE=/go/pkg/mod GOCACHE=/root/.cache/go-build go build -v -ldflags '-w -s -X 'github.com/wandera/scccmd/cmd.Version=${VERSION}
 
 # Runtime image
-FROM alpine:3.19.1
+FROM alpine:3.20.3
 RUN apk --no-cache add ca-certificates
 
 COPY --from=builder /build/scccmd /app/scccmd