Update c_cpp_properties.json (#1090)

Author: JanJecmen

.vscode/c_cpp_properties.json

@@ -5,8 +5,8 @@
             "includePath": [
                 "${workspaceFolder}/rir/src/**",
                 "${workspaceFolder}/external/custom-r/src/**",
-                "${workspaceFolder}/external/llvm-11/include/**",
-                "${workspaceFolder}/external/llvm-11.0.1.src/include/**"
+                "${workspaceFolder}/external/llvm-12/include/**",
+                "${workspaceFolder}/external/llvm-12.0.0.src/include/**"
             ],
             "defines": [
                 "ENABLE_SLOWASSERT"
@@ -19,4 +19,4 @@
         }
     ],
     "version": 4
-}
+}