Update msbuild.yml

Author: masx200

.github/workflows/msbuild.yml

@@ -72,5 +72,5 @@ jobs:
             - run: C:\hostedtoolcache\windows\xmake\dev\x64\xmake.exe build -v -y  -w --project=. "--file=./xmake.lua"
             - run: C:\hostedtoolcache\windows\xmake\dev\x64\xmake.exe clean  -a
             - run: C:\hostedtoolcache\windows\xmake\dev\x64\xmake.exe f   -y -v --project=. "--file=./xmake.lua" --mode=test
-            - run: C:\hostedtoolcache\windows\xmake\dev\x64\xmake.exe build -v -y  -w --project=. "--file=./xmake.lua" --group=test
+            - run: C:\hostedtoolcache\windows\xmake\dev\x64\xmake.exe build -v -y  -w --project=. "--file=./xmake.lua" --group=test -j 1
             - run: xmake run --group=test