update powershell tests, in new version of cobra the completion file is different

Author: umbynos

test/test_completion.py

@@ -49,8 +49,8 @@ def test_completion_powershell(run_command):
     result = run_command("completion powershell")
     assert result.ok
     assert result.stderr == ""
-    assert "Register-ArgumentCompleter -Native -CommandName 'arduino-cli' -ScriptBlock {" in result.stdout
-    assert "'arduino-cli;completion' {" in result.stdout
+    assert "# powershell completion for arduino-cli" in result.stdout
+    assert "Register-ArgumentCompleter -CommandName 'arduino-cli' -ScriptBlock" in result.stdout
 
 
 def test_completion_bash_no_desc(run_command):