Adapt CI to updated riscv64 dockerfile

https://i10git.cs.fau.de/pycodegen/pycodegen/-/commit/99a77506972607cc315bacbd63dfcaa4b8112cda updated Clang from 13-dev to 13.0.0, switched from Debian sid to Ubuntu 21.10, and updated from version 7 to version 10 of the RVV QEMU patch. Now the vector extension is no longer marked as experimental (x-).

changed the description

enabled an automatic merge when the pipeline for 1022af98 succeeds

merged

mentioned in commit 29e0e84e