chore(deps): update dependency go to v1.23.4

Author: ibm-mend-app[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/ibm-skills-network/cert-manager-webhook-ibm-cis
 
 go 1.22.0
 
-toolchain go1.23.0
+toolchain go1.23.4
 
 require (
 	github.com/IBM-Cloud/bluemix-go v0.0.0-20240719075425-078fcb3a55be