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

[Zeyi Xu via cfe-commits]

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@@ -343,7 +343,7 @@ The primary goal of experimental support is to assist in the process of ratifica
 
 `experimental-zibi`
 
-: LLVM implements the [0.1 release specification](https://github.com/riscv/zibi/releases/tag/v0.1.0).
+: LLVM implements the [0.7 draft specification](https://github.com/riscv/zibi/releases/tag/riscv-isa-release-aa5e27f-2026-07-30).
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zeyi2 wrote:

Although v0.7 is published through GitHub Releases, the [Zibi repository describes GitHub release artifacts as compiled versions of the most recent drafts](https://github.com/riscv/zibi/blob/aa5e27f4d5b9271ab448b8e0001c5a9256e483ac/README.md#L17-L20). Therefore, I think "draft specification" is more accurate here.

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