Update ELK images

elasticsearch:
- docker-library/elasticsearch@e86bdc9: Update to 6.8.9
- docker-library/elasticsearch@b8cd81a: Update to 7.7.0
- docker-library/elasticsearch@9aaa5a0: Merge pull request docker-library/elasticsearch#192 from docker-library/github-actions
- docker-library/elasticsearch@548b31c: Add initial GitHub Actions CI

logstash:
- docker-library/logstash@a205d9b: Update to 6.8.9
- docker-library/logstash@2b7e245: Update to 7.7.0
- docker-library/logstash@9f6a924: Merge pull request docker-library/logstash#97 from docker-library/github-actions
- docker-library/logstash@53eb248: Add initial GitHub Actions CI

kibana:
- docker-library/kibana@5e0efc4: Update to 6.8.9
- docker-library/kibana@e3426d2: Update to 7.7.0
- docker-library/kibana@cdaa5f1: Merge pull request docker-library/kibana#92 from docker-library/github-actions
- docker-library/kibana@4f3f74e: Add initial GitHub Actions CI

Author: docker-library-bot

library/elasticsearch

@@ -4,10 +4,10 @@ Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
              Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
 GitRepo: https://github.com/docker-library/elasticsearch.git
 
-Tags: 7.6.2
-GitCommit: 323a9028774ff18e1e3b1d0304bdd55edc88ab80
+Tags: 7.7.0
+GitCommit: b8cd81aa48870e31970acbca7ec376953810d522
 Directory: 7
 
-Tags: 6.8.8
-GitCommit: 79420fbf8e7f263bc25b4ff7c592240129ecb180
+Tags: 6.8.9
+GitCommit: e86bdc93b04fedbf1e6d0754d1f54324707439ed
 Directory: 6

library/kibana

@@ -4,10 +4,10 @@ Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
              Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
 GitRepo: https://github.com/docker-library/kibana.git
 
-Tags: 7.6.2
-GitCommit: 8e76f488b77dda7824e531450ddc08b33aae18bc
+Tags: 7.7.0
+GitCommit: e3426d2c1ba645d6e19eb0ac66d7a400fa5f3fdf
 Directory: 7
 
-Tags: 6.8.8
-GitCommit: 119c1cde627beeb27df8181f313900788399442b
+Tags: 6.8.9
+GitCommit: 5e0efc4e8d90e20f0f7faefa145b9b2aebcb2c5a
 Directory: 6

library/logstash

@@ -4,10 +4,10 @@ Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
              Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
 GitRepo: https://github.com/docker-library/logstash.git
 
-Tags: 7.6.2
-GitCommit: c75adbe14f4280d172e6e049b677215fdb225e0d
+Tags: 7.7.0
+GitCommit: 2b7e24559f1ec8105ce1f6d906eaa7b0d33775ff
 Directory: 7
 
-Tags: 6.8.8
-GitCommit: 591ffb5cdd3e61e87e582b374c9b8d72f8ee1dbe
+Tags: 6.8.9
+GitCommit: a205d9b2634606f8fe9a45ed30655acf5d3ac929
 Directory: 6