Update ELK images

elasticsearch:
- https://github.com/docker-library/elasticsearch/commit/fb24d2b: Update to 6.8.5

logstash:
- https://github.com/docker-library/logstash/commit/cbebabe: Update to 6.8.5

kibana:
- https://github.com/docker-library/kibana/commit/090ae90: Update to 6.8.5

library/elasticsearch

@@ -8,6 +8,6 @@ Tags: 7.4.2
 GitCommit: d2a9208235faa0165bd03dad612e897bdbcf09fc
 Directory: 7
 
-Tags: 6.8.4
-GitCommit: e309ccfb55a07ca50617d42c49202f1b58e65aae
+Tags: 6.8.5
+GitCommit: fb24d2b5bdbc212787c066480d818851f4da8f86
 Directory: 6

library/kibana

@@ -8,6 +8,6 @@ Tags: 7.4.2
 GitCommit: 8533a0adbbcf829e6d069fa033339d9212fb986b
 Directory: 7
 
-Tags: 6.8.4
-GitCommit: f59b7cc2287c2ad6d23ebe77e8409ac56ec453ca
+Tags: 6.8.5
+GitCommit: 090ae9080dd0bf75597a8f27a314854d06b50cb1
 Directory: 6

library/logstash

@@ -8,6 +8,6 @@ Tags: 7.4.2
 GitCommit: 08f0241e9b8f15a57a82f8d9283795f2ab71341f
 Directory: 7
 
-Tags: 6.8.4
-GitCommit: 034ec4e7c3f9156f11e8d44d850a0af637a58bea
+Tags: 6.8.5
+GitCommit: cbebabecdab7144b15e520000ca9a4a9b1a5e169
 Directory: 6