fix: change python version

Author: sevenbunu

.github/workflows/ubuntu.yml

@@ -33,7 +33,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.12'
 
       - name: Install CUDA
         env:
@@ -69,6 +69,7 @@ jobs:
 
   test:
     name: Test ${{ matrix.os }} GCC ${{ matrix.gcc }} CUDA ${{ matrix.cuda }}
+    needs: build
     runs-on: self-hosted
     strategy:
       fail-fast: false