Add JOBS parameter to GH workflows (currently default, but not guaranteed)

... and fix missing newline at EOF

.github/workflows/linux-ci.yml

@@ -13,8 +13,8 @@ jobs:
         run: |
           mkdir build && cd build
           cmake -DCMAKE_BUILD_TYPE=Debug ..
-          make -j2
+          make -j4
       - name: Test
         run: |
           cd build
-          make check
+          make check JOBS=4

.github/workflows/msvc-ci.yml

@@ -26,6 +26,7 @@ jobs:
           bash.exe ..\..\tests\all_tests.sh
         env:
           PYTHON_EXE: python.exe
+          JOBS: 4
 
       - name: Upload artifact
         uses: actions/upload-artifact@v3