ci: test io with std and alloc features.

Author: Dirbaio

.github/workflows/test.yml

@@ -25,7 +25,10 @@ jobs:
           - thumbv7m-none-eabi
         include:
           - target: x86_64-unknown-linux-gnu
-            features: embedded-hal-bus/std
+            features: embedded-hal-bus/std,embedded-io/std,embedded-io-async/std
+        include:
+          - target: x86_64-unknown-linux-gnu
+            features: embedded-io/alloc,embedded-io-async/alloc
 
     steps:
       - uses: actions/checkout@v3