[8.7](backport #34921) Stop crossbuilding using Debian 8

[mergify]

This is an automatic backport of pull request #34921 done by Mergify.

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• Start Time: 2023-03-27T16:14:39.467+0000

• Duration: 92 min 56 sec

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Test	Results
Failed	0
Passed	25941
Skipped	1968
Total	27909

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[andrewkroh]

I think we should hold off on this backport until we resolve this issue of breaking Packetbeat on linux/386 as described in #34938 (comment).

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.7/pr-34921 upstream/mergify/bp/8.7/pr-34921
git merge upstream/8.7
git push upstream mergify/bp/8.7/pr-34921

[andrewkroh]

#34939 was backported to fix the 8.7 build.