gh-97005: Update libexpat from 2.4.7 to 2.4.9

[corona10]

• Issue: Upgrade our bundled copy of libexpat to the latest (2.4.9?) #97005

[corona10]

For verification

# Copyright (c) 2022 Sebastian Pipping <sebastian@pipping.org># Licensed under the Apache License version 2.0FROM alpine
RUN apk add --update \
diffutils \
git \
sed \
&& \
git clone --depth 1 https://github.com/python/cpython cpython-main \
&& \
( cd cpython-main && git rev-parse HEAD ) \
&& \
git clone --depth 1 --branch gh-97005 https://github.com/corona10/cpython corona10-gh-97005 \
&& \
( cd corona10-gh-97005 && git rev-parse HEAD ) \
&& \
git config --global advice.detachedHead false \
&& \
git clone --depth 1 --branch R_2_4_7 https://github.com/libexpat/libexpat libexpat_2_4_7 \
&& \
git clone --depth 1 --branch R_2_4_9 https://github.com/libexpat/libexpat libexpat_2_4_9 \
&& \
diff -r -u libexpat_2_4_7/expat/lib/ cpython-main/Modules/expat/ | tee 2-4-7.diff \
&& \
diff -r -u libexpat_2_4_9/expat/lib/ corona10-gh-97005/Modules/expat/ | tee 2-4-9.diff \
&& \
sed -e '/^Only in /d' -e '/^\(+++\|---\) /d' -e '/^diff /d' -i 2-4-7.diff 2-4-9.diff \
&& \
diff -u 2-4-7.diff 2-4-9.diff \
&& \
echo 'Diff is good.'

[corona10]

cc @hartwork

[gpshead]

I verified the update by diffing Modules/expat/ against https://github.com/libexpat/libexpat/tree/R_2_4_9 expat/

[miss-islington]

Thanks @corona10 for the PR 🌮🎉.. I'm working now to backport this PR to: 3.7, 3.8, 3.9, 3.10, 3.11.
🐍🍒⛏🤖

[bedevere-bot]

GH-97010 is a backport of this pull request to the 3.11 branch.

[bedevere-bot]

GH-97011 is a backport of this pull request to the 3.10 branch.

[bedevere-bot]

GH-97012 is a backport of this pull request to the 3.9 branch.

[bedevere-bot]

GH-97013 is a backport of this pull request to the 3.8 branch.

[bedevere-bot]

GH-97014 is a backport of this pull request to the 3.7 branch.