remove arch from tests-nightly.yml

Author: cjdoris

.github/workflows/tests-nightly.yml

@@ -10,20 +10,18 @@ on:
 
 jobs:
   tests:
-    name: Test Julia (${{ matrix.jlversion }}, ${{ matrix.os }}-${{ matrix.arch }})
+    name: Test Julia (${{ matrix.jlversion }}, ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        arch: [x64] # x86 unsupported by MicroMamba
         os: [ubuntu-latest, windows-latest, macos-latest]
         jlversion: ['~1.9.0-0', 'nightly']
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ inputs.jl_version }}
-          arch: ${{ matrix.arch }}
       - uses: actions/cache@v5
         env:
           cache-name: cache-artifacts