fix: translations/pt-BR/content/actions/creating-actions/dockerfile-s…

…upport-for-github-actions.md to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN9-APT-407402
- https://snyk.io/vuln/SNYK-DEBIAN9-E2FSPROGS-468975
- https://snyk.io/vuln/SNYK-DEBIAN9-E2FSPROGS-540843
- https://snyk.io/vuln/SNYK-DEBIAN9-LIBGCRYPT20-1582895
- https://snyk.io/vuln/SNYK-DEBIAN9-TAR-312293

translations/pt-BR/content/actions/creating-actions/dockerfile-support-for-github-actions.md

@@ -67,7 +67,7 @@ ENTRYPOINT ["sh", "-c", "echo $GITHUB_SHA"]
 
 ```dockerfile
 # Container image that runs your code
-FROM debian:9.5-slim
+FROM debian:9-slim
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh