Don't specify arch in ci matrix (#464)

Author: jishnub

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
   test:
     needs: pre_job
     if: needs.pre_job.outputs.should_skip != 'true'
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ matrix.version == 'nightly' }}
     strategy:
@@ -45,14 +45,11 @@ jobs:
           - ubuntu-latest
           - macOS-latest
           - windows-latest
-        arch:
-          - x64
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
       - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts