lowering parallel level to see if we can get to run

Author: arashbm

.github/workflows/tests.yml

@@ -2,7 +2,7 @@ name: Run tests
 on: [workflow_dispatch]
 
 env:
-  CMAKE_BUILD_PARALLEL_LEVEL: 4
+  CMAKE_BUILD_PARALLEL_LEVEL: 2
   SKBUILD_CMAKE_ARGS: "-DCMAKE_C_COMPILER_LAUNCHER=ccache;-DCMAKE_CXX_COMPILER_LAUNCHER=ccache"
   CCACHE_NOHASHDIR: "true"
   CCACHE_COMPILERCHECK: "content"