fix testing instruction "hello world" on Windows

[neuromagus]

need add instruction for update Pester version (and, maybe, for update Pshell on 7ver)

If testing 'Hello world' on Windows 10 default config (22H2 with installed all updates), I have this error:

RuntimeException: The BeforeAll command may only be used inside a Describe block
// blah-blah
RuntimeException: '-Be' is not a valid Should operator

[github-actions]

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