Update ELK images

elasticsearch:
- https://github.com/docker-library/elasticsearch/commit/a72677b: Merge pull request https://github.com/docker-library/elasticsearch/pull/193 from docker-library/diff
- https://github.com/docker-library/elasticsearch/commit/9a07fe3: Add "docker build" example command to generated Dockerfiles

logstash:
- https://github.com/docker-library/logstash/commit/e677a5a: Merge pull request https://github.com/docker-library/logstash/pull/99 from docker-library/diff
- https://github.com/docker-library/logstash/commit/0d64798: Add "docker build" example command to generated Dockerfiles

kibana:
- https://github.com/docker-library/kibana/commit/a79c4d3: Merge pull request https://github.com/docker-library/kibana/pull/93 from docker-library/diff
- https://github.com/docker-library/kibana/commit/f3512f9: Add "docker build" example command to generated Dockerfiles

library/elasticsearch

@@ -5,9 +5,9 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/elasticsearch.git
 
 Tags: 7.7.0
-GitCommit: b8cd81aa48870e31970acbca7ec376953810d522
+GitCommit: 9a07fe301328cb6dfc6cc6aeed784bdc51c31eca
 Directory: 7
 
 Tags: 6.8.9
-GitCommit: e86bdc93b04fedbf1e6d0754d1f54324707439ed
+GitCommit: 9a07fe301328cb6dfc6cc6aeed784bdc51c31eca
 Directory: 6

library/kibana

@@ -5,9 +5,9 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/kibana.git
 
 Tags: 7.7.0
-GitCommit: e3426d2c1ba645d6e19eb0ac66d7a400fa5f3fdf
+GitCommit: f3512f90b2c0be7c3547095a0bd1e607e18e9af3
 Directory: 7
 
 Tags: 6.8.9
-GitCommit: 5e0efc4e8d90e20f0f7faefa145b9b2aebcb2c5a
+GitCommit: f3512f90b2c0be7c3547095a0bd1e607e18e9af3
 Directory: 6

library/logstash

@@ -5,9 +5,9 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
 GitRepo: https://github.com/docker-library/logstash.git
 
 Tags: 7.7.0
-GitCommit: 2b7e24559f1ec8105ce1f6d906eaa7b0d33775ff
+GitCommit: 0d647982be457e2a1f1910a143eff0778ba09f76
 Directory: 7
 
 Tags: 6.8.9
-GitCommit: a205d9b2634606f8fe9a45ed30655acf5d3ac929
+GitCommit: 0d647982be457e2a1f1910a143eff0778ba09f76
 Directory: 6