Raise ImportWarning when calling find_loader()

[brettcannon]

BPO	43672
Nosy	@brettcannon
PRs	bpo-43672: raise ImportWarning when calling find_loader() #25119

^{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 = 'https://github.com/brettcannon'
closed_at = <Date 2021-04-02.19:36:01.152>
created_at = <Date 2021-03-30.15:44:53.171>
labels = ['interpreter-core', '3.10']
title = 'Raise ImportWarning when calling find_loader()'
updated_at = <Date 2021-04-02.19:36:01.151>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2021-04-02.19:36:01.151>
actor = 'brett.cannon'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2021-04-02.19:36:01.152>
closer = 'brett.cannon'
components = ['Interpreter Core']
creation = <Date 2021-03-30.15:44:53.171>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 43672
keywords = ['patch']
message_count = 2.0
messages = ['389834', '390094']
nosy_count = 1.0
nosy_names = ['brett.cannon']
pr_nums = ['25119']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43672'
versions = ['Python 3.10']

[brettcannon]

Using find_loader() in the import system should raise ImportWarning to start transitioning people over to find_spec() who haven't migrated since Python 3.4.

[brettcannon]

New changeset f97dc80 by Brett Cannon in branch 'master':
bpo-43672: raise ImportWarning when calling find_loader() (GH-25119)
f97dc80