Stop trying to split command over multiple lines

Author: hannes-steffenhagen-diffblue

.github/workflows/pull-request-checks.yaml

@@ -20,10 +20,7 @@ jobs:
         run: |
           mkdir build
           cd build
-          cmake .. -G Ninja \\
-            -DCMAKE_BUILD_TYPE=Release \\
-            -DCMAKE_C_COMPILER=/usr/bin/gcc \\
-            -DCMAKE_CXX_COMPILER=/usr/bin/g++
+          cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/bin/gcc -DCMAKE_CXX_COMPILER=/usr/bin/g++
       - name: Build with Ninja
         run: cd build; ninja
       - name: Run tests