[CI] don't run bethe bloch example for now under windows

For some reason in CI in this repo lapack isn't found using msys2. But
it works fine in ggplotnim using the same approach. Weird.

unchained.nimble

@@ -16,7 +16,8 @@ task installTestDeps, "Install dependencies to run tests in CI":
 task test, "Runs the test":
   exec "nim c -r tests/tunchained.nim"
   exec "nim c -r tests/tresolveAlias.nim"
-  exec "nim c -r examples/bethe_bloch.nim"
+  when not defined(windows): # For some reason in CI in this repo lapack isn't found using msys2 (works in ggplotnim)
+    exec "nim c -r examples/bethe_bloch.nim"
   exec "nim c -r examples/custom_unit_system.nim"
 
 task regressionTests, "Run regression tests (require cligen)":