CI: use Arm runner for neon regression tests

Author: mkannwischer

.github/workflows/test_basic.yaml

@@ -84,7 +84,7 @@ jobs:
       run: |
         python3 example.py --examples ntt_kyber_1_23_45_67_m55,ntt_dilithium_12_34_56_78_m55 --timeout=300
   examples_ntt_kyber_dilithium_neon_core:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04-arm
     steps:
     - uses: actions/checkout@v3
     - uses: ./.github/actions/setup-ubuntu