Add new github RSA key (node-red#362)

Author: hardillb

docker-custom/known_hosts.sh

@@ -45,7 +45,7 @@ ssh-keygen -l -f ${known_hosts_file} | sort > "$fingerprints"
 
 diff - "$fingerprints" <<EOF
 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
-2048 SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8 github.com (RSA)
+2048 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
 2048 SHA256:zzXQOXSRBEiUtuE8AikJYKwbHaxvSc0ojez9YXaGp1A bitbucket.org (RSA)