fix exclusion of windows

Used old branch instead of nim...

Author: Vindaar

.github/workflows/ci.yml

@@ -29,6 +29,9 @@ jobs:
             builder: macos-latest
           - target: windows
             builder: windows-latest
+        exclude:
+          - target: windows
+            nim: devel
     name: '${{ matrix.target }} (${{ matrix.nim }})'
     runs-on: ${{ matrix.builder }}
     steps: