hmac.update is not releasing the GIL when openssl's hmac is used

[gpshead]

BPO	44145
Nosy	@gpshead, @tiran, @miss-islington
PRs	bpo-44145: Release the GIL around HMAC_Update. #26157 [3.10] bpo-44145: Release the GIL around HMAC_Update. (GH-26157) #26187 [3.9] bpo-44145: Release the GIL around HMAC_Update. (GH-26157) #26188

^{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/gpshead'
closed_at = <Date 2021-07-07.15:47:58.628>
created_at = <Date 2021-05-16.06:54:04.365>
labels = ['extension-modules', '3.11', '3.9', '3.10', 'performance']
title = "hmac.update is not releasing the GIL when openssl's hmac is used"
updated_at = <Date 2021-07-07.15:47:58.627>
user = 'https://github.com/gpshead'

bugs.python.org fields:

activity = <Date 2021-07-07.15:47:58.627>
actor = 'gregory.p.smith'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2021-07-07.15:47:58.628>
closer = 'gregory.p.smith'
components = ['Extension Modules']
creation = <Date 2021-05-16.06:54:04.365>
creator = 'gregory.p.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 44145
keywords = ['patch', '3.9regression']
message_count = 3.0
messages = ['393733', '393791', '393792']
nosy_count = 3.0
nosy_names = ['gregory.p.smith', 'christian.heimes', 'miss-islington']
pr_nums = ['26157', '26187', '26188']
priority = 'normal'
resolution = 'fixed'
stage = 'commit review'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue44145'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[gpshead]

This prevents parallel hmac computations.

see michaelforney's comment left on #20129
where the problem was introduced when adding support for using OpenSSL's HMAC implementations.

easy fix. PR coming.

We don't really have a way to unittest for regressions on things like this.

[miss-islington]

New changeset 60fa8b3 by Miss Islington (bot) in branch '3.10':
bpo-44145: Release the GIL around HMAC_Update. (GH-26157)
60fa8b3

[miss-islington]

New changeset 2057ce8 by Miss Islington (bot) in branch '3.9':
[3.9] bpo-44145: Release the GIL around HMAC_Update. (GH-26157) (GH-26188)
2057ce8