Update KrakenD to v2.9.4

Signed-off-by: Daniel Ortiz <dortiz@krakend.io>

Author: taik0

library/krakend

@@ -3,7 +3,7 @@ Maintainers: Daniel Ortiz <dortiz@krakend.io> (@taik0),
 GitRepo: https://github.com/krakendio/docker-library.git
 
 # Alpine images
-Tags: 2.9.3, 2.9, 2, latest
+Tags: 2.9.4, 2.9, 2, latest
 Architectures: amd64, arm64v8
-GitCommit: bac1c35e5818831f0669176ab140e34705185b55
-Directory: 2.9.3
+GitCommit: 899edf02008935285c06b651706d74c275459420
+Directory: 2.9.4