use golang 1.24 for mod and toolchain

Author: biscout42

go.mod

@@ -2,8 +2,6 @@ module github.com/elastic/terraform-provider-elasticstack
 
 go 1.24.0
 
-toolchain go1.25.0
-
 require (
 	github.com/disaster37/go-kibana-rest/v8 v8.5.0
 	github.com/elastic/elastic-transport-go/v8 v8.7.0