Fix check-cfg workflow

Author: pvdrz

.github/workflows/bindgen.yml

@@ -238,7 +238,7 @@ jobs:
           override: true
 
       - name: Check cfg
-        run: cargo check -Z unstable-options -Z check-cfg=features
+        run: cargo check -Z unstable-options -Z check-cfg
 
   test-book:
     runs-on: ubuntu-latest