Update dependency go to v1.23.6

Author: renovate[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/netlify/terraform-provider-netlify
 
 go 1.22.7
 
-toolchain go1.23.4
+toolchain go1.23.6
 
 require (
 	github.com/go-swagger/go-swagger v0.30.5