Update bundled pip to 21.1.1

sbidoul

BPO	43993
Nosy	@pfmoore, @sbidoul
PRs	bpo-43993: Update vendored pip to 21.1.1 #25761 [3.9] bpo-43993: Update vendored pip to 21.1.1 (GH-25761). #25782 [3.8] bpo-43993: Update vendored pip to 21.1.1 (GH-25761). #25783

^{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 2021-05-01.16:06:10.444>
created_at = <Date 2021-04-30.18:55:41.346>
labels = ['3.8', '3.9', '3.10']
title = 'Update bundled pip to 21.1.1'
updated_at = <Date 2021-05-02.10:33:29.972>
user = 'https://github.com/sbidoul'

bugs.python.org fields:

activity = <Date 2021-05-02.10:33:29.972>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-01.16:06:10.444>
closer = 'sbidoul'
components = []
creation = <Date 2021-04-30.18:55:41.346>
creator = 'sbidoul'
dependencies = []
files = []
hgrepos = []
issue_num = 43993
keywords = ['patch']
message_count = 4.0
messages = ['392502', '392575', '392600', '392601']
nosy_count = 2.0
nosy_names = ['paul.moore', 'sbidoul']
pr_nums = ['25761', '25782', '25783']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43993'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']