[8.x](backport #5847) Switch crossbuilding to Debian 11 #5848
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We're dropping support for Debian 10,
so no need to crossbuild using the outdated image anymore.
This also updates the statically linked glibc from 2.19 to 2.31.
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This is an automatic backport of pull request Switch crossbuilding to Debian 11 #5847 done by Mergify.