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

@@ -16,7 +16,7 @@ RUN apk --no-cache add make git gcc libc-dev curl ca-certificates binutils-gold
 
 # -----------------------------------------------------------------------------
 # Image...
-FROM alpine:3.19.1
+FROM alpine:3.20.3
 
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=build /popeye/execs/popeye /bin/popeye