[clang] [llvm] [RISCV] Bump experimental Zibi to version 0.7 (PR #223578)

[Pengcheng Wang via cfe-commits]

wangpc-pp wrote:

It is now v0.9 in https://github.com/riscv/riscv-isa-manual/pull/3343. I presume it will be ratified soon so I think we can just wait and upgrade the version to 1.0.

https://github.com/llvm/llvm-project/pull/223578