bumped Alpine version from 3.16.2 to 3.16.9 to fix vulnerabilities

Signed-off-by: Rocio Roman <[email protected]>
Signed-off-by: Rocio Roman <[email protected]>

custom/hardened-alpine/experiment/Dockerfile

@@ -1,7 +1,7 @@
 # This Dockerfile contains the hardened alpine image with all the
 # litmus experiment dependencies installed.
 # It is also made non-root, sudo-enabled with default litmus directory.
-FROM alpine:3.16.2
+FROM alpine:3.16.9
 
 LABEL maintainer="LitmusChaos"