Update Liberty version in .env file

Author: lgrateau

.env

@@ -21,7 +21,7 @@ REPOSITORY=ibmcom
 PREFIXIMAGE=odm
 
 # Liberty Version
-FROMLIBERTY=icr.io/appcafe/websphere-liberty:25.0.0.12-kernel-java21-openj9-ubi-minimal
+FROMLIBERTY=icr.io/appcafe/websphere-liberty:26.0.0.6-kernel-java21-openj9-ubi-minimal
 
 PACKAGELIST="servlet-6.0 pages-3.1 jdbc-4.3 appSecurity-5.0 concurrent-3.0 jndi-1.0 audit-2.0 logstashcollector-1.0 mpMetrics-5.1 openidconnectclient-1.0 collectiveMember-1.0 sessionCache-1.0 ldapRegistry-3.0 monitor-1.0 transportSecurity-1.0"