Fix runner label

Author: Qubitol

.github/workflows/c-cpp.yml

@@ -57,8 +57,7 @@ jobs:
     - name: make test
       run: make BACKEND=${{ matrix.backend }} OMPFLAGS= FPTYPE=${{ matrix.precision }} -C ${{ matrix.folder }} -f cudacpp.mk test
   GPU:
-    runs-on:
-      group: NGT
+    runs-on: madgraph5-h100
     env:
       CUDA_HOME: /usr/local/cuda/
       FC: gfortran