Update ci.yml

Author: DilumAluthge

.github/workflows/ci.yml

@@ -20,14 +20,9 @@ jobs:
           - 'nightly'
         os:
           - ubuntu-latest
-          - macos-latest
           - windows-latest
         arch:
           - x64
-          - x86
-        exclude:
-          - os: macOS-latest
-            arch: x86 # 32-bit Julia binaries are not available on macOS
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1