ci: install cargo-fuzz with stable toolchain

The rustc version 1.77.0-nightly does not meet the requirement of
`cargo-platform v0.1.9`. Use latest stable toolchain to install the
`cargo-fuzz`.

Signed-off-by: Jiaqi Gao <[email protected]>

Author: gaojiaqi7

.github/workflows/fuzz.yml

@@ -36,7 +36,7 @@ jobs:
           components: rust-src, llvm-tools-preview
 
       - name: Run cargo install cargo-xbuild
-        run: cargo install cargo-xbuild
+        run: cargo +stable install cargo-xbuild
 
       - name: install NASM
         uses: ilammy/setup-nasm@v1