Correct build.yml file

Author: lshaw8317

.github/workflows/build.yml

@@ -23,39 +23,38 @@ jobs:
           - os: ubuntu-latest
             arch: x86_64
             artifact_name: "linux-x86_64"
-            numpy-version: [null]
+            numpy-version: null
 
             # Linux x86_64 with numpy 1.23
           - os: ubuntu-latest
             arch: x86_64
             artifact_name: "linux-x86_64_numpy1_23"
-            python-version: "3.12"
             numpy-version: "1.23"
 
           # Linux ARM64 builds (native runners)
           - os: ubuntu-24.04-arm
             arch: aarch64
             artifact_name: "linux-aarch64"
-            numpy-version: [null]
+            numpy-version: null
 
           # Windows builds
           - os: windows-latest
             arch: x86_64
             artifact_name: "windows-x86_64"
-            numpy-version: [null]
+            numpy-version: null
 
           # macOS builds (universal2)
           - os: macos-latest
             arch: x86_64
             artifact_name: "macos-universal2"
-            numpy-version: [null]
+            numpy-version: "null"
     steps:
       - uses: actions/checkout@v3
 
       - uses: actions/setup-python@v3
         name: Install Python
         with:
-          python-version: '3.x'
+          python-version: '3.12'
 
       - name: Install specific numpy version
         if: matrix.numpy-version