pathlib.Path.__enter__() should emit DeprecationWarning

[barneygale]

BPO	46556
Nosy	@brettcannon, @barneygale
PRs	bpo-46556: emit DeprecationWarning from pathlib.Path.__enter__() #30971

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-02-08.21:02:04.592>
created_at = <Date 2022-01-27.23:07:21.767>
labels = ['type-bug', 'library', '3.11']
title = 'pathlib.Path.__enter__() should emit DeprecationWarning'
updated_at = <Date 2022-02-08.21:02:04.592>
user = 'https://github.com/barneygale'

bugs.python.org fields:

activity = <Date 2022-02-08.21:02:04.592>
actor = 'brett.cannon'
assignee = 'none'
closed = True
closed_date = <Date 2022-02-08.21:02:04.592>
closer = 'brett.cannon'
components = ['Library (Lib)']
creation = <Date 2022-01-27.23:07:21.767>
creator = 'barneygale'
dependencies = []
files = []
hgrepos = []
issue_num = 46556
keywords = ['patch']
message_count = 2.0
messages = ['411936', '412870']
nosy_count = 2.0
nosy_names = ['brett.cannon', 'barneygale']
pr_nums = ['30971']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46556'
versions = ['Python 3.11']

[barneygale]

In Python 3.9 / bpo-39682 we made Path.__exit__() a no-op, and added a comment in the code mentioning that it should be deprecated in future. The future is here, so let's deprecate it.

[brettcannon]

New changeset 06e1701 by Barney Gale in branch 'main':
bpo-46556: emit DeprecationWarning from pathlib.Path.__enter__() (GH-30971)
06e1701

[dss010101]

so how do we use Path to avoid this warning?