Update go.mod to use Go 1.24.2 (#1048)

Closes #1047

Author: javorszky

go.mod

@@ -1,8 +1,6 @@
 module github.com/nginx/nginx-prometheus-exporter
 
-go 1.23.0
-
-toolchain go1.24.2
+go 1.24.2
 
 require (
 	github.com/alecthomas/kingpin/v2 v2.4.0