Update ELK images

elasticsearch:
- https://github.com/docker-library/elasticsearch/commit/c9d6474: Update to 7.17.7

logstash:
- https://github.com/docker-library/logstash/commit/2075658: Update to 7.17.7

kibana:
- https://github.com/docker-library/kibana/commit/38a6938: Update to 7.17.7

library/elasticsearch

@@ -9,9 +9,9 @@ Architectures: amd64, arm64v8
 GitCommit: 9ba4ef7b355d76d73d40970cfcede212fc6f8265
 Directory: 8
 
-Tags: 7.17.6
+Tags: 7.17.7
 Architectures: amd64, arm64v8
-GitCommit: 752ea7a8ddcf0a209377f572cfcfdb220bde24ab
+GitCommit: c9d6474663e3d707c9792e793c4e67d6b773f006
 Directory: 7
 
 Tags: 6.8.23

library/kibana

@@ -9,9 +9,9 @@ Architectures: amd64, arm64v8
 GitCommit: 1a6d08e527559342e60f3badf0681b7a6d08f47d
 Directory: 8
 
-Tags: 7.17.6
+Tags: 7.17.7
 Architectures: amd64, arm64v8
-GitCommit: cde42377b65bfe5040c87c10e5defe1137a84f25
+GitCommit: 38a693842d361744c409b655bfa2c1d4a4f90278
 Directory: 7
 
 Tags: 6.8.23

library/logstash

@@ -9,9 +9,9 @@ Architectures: amd64, arm64v8
 GitCommit: 53f3e4363437b86496f1a8d53e4348633cb9969d
 Directory: 8
 
-Tags: 7.17.6
+Tags: 7.17.7
 Architectures: amd64, arm64v8
-GitCommit: 9ac7affbbe2478d5292ea4992b73b26e692a1e5f
+GitCommit: 20756581f2b7799bc39b4e47d47722de4fbf3712
 Directory: 7
 
 Tags: 6.8.23