Update CI.yml

Author: pfitzseb

.github/workflows/CI.yml

@@ -20,15 +20,13 @@ jobs:
           - ubuntu-latest
           - macos-latest
           - windows-latest
-        arch:
-          - x64
     env:
       PYTHON: ""
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/install-juliaup@v2
         with:
-           channel: ${{matrix.channel}}
+           channel: ${{matrix.version}}
       - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts