Exclude benches from tests

.github/workflows/ci.yml

@@ -82,7 +82,12 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
             command: test
-            args: --all --all-features -- --skip dpc --skip integration_test
+            args: "--all \
+                   --all-features \
+                   --exclude cp-benches \
+                   --exclude algebra-benches \
+                   --exclude ff-fft-benches \
+                   -- --skip dpc --skip integration_test"
 
   check_no_std:
     name: Check no_std