[FEAT] Upgrade ELK Version

Docker ELK Tags availability:

• https://hub.docker.com/layers/kibana/library/kibana/7.12.1/images/sha256-db88d7069c91b586dbef1c518e33cd527b649caf0002c3976c3323faf04314c2?context=explore
• https://hub.docker.com/layers/elasticsearch/library/elasticsearch/7.12.1/images/sha256-c3a165c618a19a4a8da009698eab0ac4951b3f54f07866c77981f013233ec23b?context=explore
• https://hub.docker.com/layers/logstash/library/logstash/7.12.1/images/sha256-d94f77af1d2ec86861d0b59e66d34e315acf769006b0b0d25b9ec07e45550c60?context=explore

Commits

• ELK Docker version change to 7.12.1