fix: monitoring-as-code/tools/promtool/Dockerfile to reduce vulnerabi…

…lities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE316-OPENSSL-3314624
- https://snyk.io/vuln/SNYK-ALPINE316-OPENSSL-3314624
- https://snyk.io/vuln/SNYK-ALPINE316-OPENSSL-3314641
- https://snyk.io/vuln/SNYK-ALPINE316-OPENSSL-3314643
- https://snyk.io/vuln/SNYK-ALPINE316-OPENSSL-3368756

monitoring-as-code/tools/promtool/Dockerfile

@@ -7,7 +7,7 @@ RUN VERSION=$(curl -Ls https://api.github.com/repos/prometheus/prometheus/releas
      | tar xvzf - "prometheus-$VERSION.linux-amd64"/promtool --strip-components=1 && cp promtool /go/bin/promtool
 
 
-FROM alpine:3.16.2 AS runner
+FROM alpine:3.19 AS runner
 
 COPY --from=builder /go/bin/promtool /usr/local/bin