Update httpd

Changes:

- https://github.com/docker-library/httpd/commit/6f891de: Merge pull request https://github.com/docker-library/httpd/pull/161 from J0WI/alpine-3.12
- https://github.com/docker-library/httpd/commit/b52f30b: Upgrade Alpine to 3.12
- https://github.com/docker-library/httpd/commit/1f4f797: Merge pull request https://github.com/docker-library/httpd/pull/159 from docker-library/github-actions
- https://github.com/docker-library/httpd/commit/13a3f77: Add initial GitHub Actions CI

library/httpd

@@ -11,5 +11,5 @@ Directory: 2.4
 
 Tags: 2.4.43-alpine, 2.4-alpine, 2-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 6c8e82e20ecefc94c616439f15d14c4bb215b200
+GitCommit: b52f30b211a0e127d498ce7ecbcbb31e6336cff2
 Directory: 2.4/alpine