Switch to nightly for hexagon to use "-Z" commands

Author: androm3da

.github/workflows/main.yml

@@ -65,7 +65,7 @@ jobs:
     - run: cargo check --tests -vv --target=powerpc64le-unknown-linux-gnu
     - run: cargo check --tests -vv --target=armv5te-unknown-linux-gnueabi
     - run: cargo check --tests -vv --target=loongarch64-unknown-linux-gnu
-    - run: cargo check --tests -vv --target=hexagon-unknown-linux-musl -Zbuild-std -Zbuild-std-features=llvm-libunwind
+    - run: cargo +nightly check --tests -vv --target=hexagon-unknown-linux-musl -Zbuild-std -Zbuild-std-features=llvm-libunwind
 
   gen:
     name: Update generated files