Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -119,7 +119,7 @@ jobs:
         run: |
           call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate xeus-cpp
           cd build
-          set CL=/MP]
+          set CL=/MP
           nmake check-xeus-cpp
           nmake install