fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-6913411
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249236
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249265
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249265
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-7249419

Dockerfile

@@ -27,7 +27,7 @@ RUN CGO_ENABLED=0 go build \
 ############################################################
 # Runtime Image
 ############################################################
-FROM alpine:3.18
+FROM alpine:3
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /app/bin/kminion /app/kminion
 RUN addgroup -S redpanda \