self.assertDictContainsSubset warning is unhelpful

[asottile]

BPO	44295
Nosy	@asottile
PRs	[3.10] bpo-44295: ensure deprecation warning from assertDictContainsSubset points at actual test code #26497

^{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 2021-11-16.03:11:19.316>
created_at = <Date 2021-06-02.23:32:40.294>
labels = ['type-bug', 'library', '3.10']
title = 'self.assertDictContainsSubset warning is unhelpful'
updated_at = <Date 2021-11-16.03:11:19.315>
user = 'https://github.com/asottile'

bugs.python.org fields:

activity = <Date 2021-11-16.03:11:19.315>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = <Date 2021-11-16.03:11:19.316>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2021-06-02.23:32:40.294>
creator = 'Anthony Sottile'
dependencies = []
files = []
hgrepos = []
issue_num = 44295
keywords = ['patch']
message_count = 2.0
messages = ['394953', '405479']
nosy_count = 1.0
nosy_names = ['Anthony Sottile']
pr_nums = ['26497']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44295'
versions = ['Python 3.10']

[asottile]

it's missing stacklevel= -- mostly creating a bpo issue to link to

[asottile]

looks like this was removed in 3.11 -- wondering if it's still worth correcting the deprecation warning location