update to expat 2.2.6

[benjaminp]

BPO	34625
Nosy	@benjaminp, @miss-islington
PRs	bpo-34625: Update vendorized expat version to 2.2.6. #9150 [3.7] bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150) #9157 [3.6] bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150) #9158 [2.7] bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150) #9159

^{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 2018-09-11.04:06:46.962>
created_at = <Date 2018-09-11.00:44:23.612>
labels = ['expert-XML', '3.7', '3.8']
title = 'update to expat 2.2.6'
updated_at = <Date 2018-09-11.04:56:53.862>
user = 'https://github.com/benjaminp'

bugs.python.org fields:

activity = <Date 2018-09-11.04:56:53.862>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2018-09-11.04:06:46.962>
closer = 'benjamin.peterson'
components = ['XML']
creation = <Date 2018-09-11.00:44:23.612>
creator = 'benjamin.peterson'
dependencies = []
files = []
hgrepos = []
issue_num = 34625
keywords = ['patch']
message_count = 5.0
messages = ['324967', '324978', '324979', '324984', '324986']
nosy_count = 2.0
nosy_names = ['benjamin.peterson', 'miss-islington']
pr_nums = ['9150', '9157', '9158', '9159']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34625'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[benjaminp]

libexpat 2.2.6 has been released. We should update our vendorized version.

[benjaminp]

New changeset 5033aa7 by Benjamin Peterson in branch 'master':
bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150)
5033aa7

[miss-islington]

New changeset 7a501de by Miss Islington (bot) in branch '2.7':
bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150)
7a501de

[miss-islington]

New changeset 2bc4eea by Miss Islington (bot) in branch '3.7':
bpo-34625: Update vendorized expat version to 2.2.6. (GH-9150)
2bc4eea

[benjaminp]

New changeset b2260e5 by Benjamin Peterson (Miss Islington (bot)) in branch '3.6':
bpo-34625: Update vendorized expat version to 2.2.6. (GH-9158)
b2260e5