fix: Stop running go mod tidy in setup.py

Signed-off-by: Achal Shah <achals@gmail.com>

This fixes a problem similar to pypa/cibuildwheel#189 (comment).

Running `go mod tidy` was updating `go.mod` and `go.sum`, which was causeing cibuildwheel to produce dirty builds. This comamnd isn't really even needed, so nixing it.

setup.py

@@ -434,8 +434,6 @@ def build_extension(self, ext: Extension):
                               env={"PATH": bin_path, **go_env})
         subprocess.check_call(["go", "install", "github.com/go-python/gopy"],
                               env={"PATH": bin_path, **go_env})
-        subprocess.check_call(["go", "mod", "tidy"],
-                              env={"PATH": bin_path, **go_env})
         subprocess.check_call(
             [
                 "gopy",