build: use go 1.23.6

The go_mod_vendor CI job suggests to run `go mod tidy`, and this change
is the result.

Signed-off-by: Niels de Vos <ndevos@ibm.com>

Author: nixpanic

go.mod

@@ -1,7 +1,6 @@
 module github.com/csi-addons/kubernetes-csi-addons
 
-go 1.23.0
-toolchain go1.23.6
+go 1.23.6
 
 require (
 	github.com/container-storage-interface/spec v1.11.0