Update workflows

Author: eel76-hmi

.github/workflows/tests.yml

@@ -42,8 +42,7 @@ jobs:
     - name: Configure CMake
       run: >
         cmake -B ${{ steps.strings.outputs.build-output-dir }}
-        -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
-        -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
+        -DCMAKE_CXX_COMPILER=${{ matrix.cxx_compiler }}
         -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
         -S ${{ github.workspace }}