github: Include the architecture in the linux-asserts artifact name

This should make it clearer what it is.

.github/workflows/build.yml

@@ -251,7 +251,7 @@ jobs:
           tar -Jcf ../llvm-mingw-linux.tar.xz --format=ustar --numeric-owner --owner=0 --group=0 --sort=name --mtime="$BUILD_DATE" llvm-mingw
       - uses: actions/upload-artifact@v4
         with:
-          name: linux-asserts-toolchain
+          name: linux-asserts-x86_64-toolchain
           path: |
             llvm-mingw-linux.tar.xz
           retention-days: 7
@@ -710,7 +710,7 @@ jobs:
     steps:
       - uses: actions/download-artifact@v4
         with:
-          name: linux-asserts-toolchain
+          name: linux-asserts-x86_64-toolchain
       - name: Unpack cross toolchain
         run: |
           tar -Jxf llvm-mingw-*.tar.xz