Update ELK images

elasticsearch:
- https://github.com/docker-library/elasticsearch/commit/7bff32a: Update to 7.9.2

logstash:
- https://github.com/docker-library/logstash/commit/39bfe23: Update to 7.9.2

kibana:
- https://github.com/docker-library/kibana/commit/e34ff79: Update to 7.9.2

library/elasticsearch

@@ -4,9 +4,9 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/elasticsearch.git
 
-Tags: 7.9.1
+Tags: 7.9.2
 Architectures: amd64, arm64v8
-GitCommit: e773fb6d9c79d65310a0d6d41f9bf4f2cc336521
+GitCommit: 7bff32a5cb4329b1f826c80430070933731d457d
 Directory: 7
 
 Tags: 6.8.12

library/kibana

@@ -4,8 +4,8 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/kibana.git
 
-Tags: 7.9.1
-GitCommit: 57a6a9708ee050e740ffac635acfaf520c8f2f4b
+Tags: 7.9.2
+GitCommit: e34ff79e206b943b8630f5cbb8935b27979f1fb1
 Directory: 7
 
 Tags: 6.8.12

library/logstash

@@ -4,8 +4,8 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/logstash.git
 
-Tags: 7.9.1
-GitCommit: d3a4a18b5337d706ea1ce614273cea71edf4d69d
+Tags: 7.9.2
+GitCommit: 39bfe23a2bd7ba8fe23ad8509fd83aeb244a21d0
 Directory: 7
 
 Tags: 6.8.12