build all features for MSRV

.github/workflows/rust.yml

@@ -274,20 +274,11 @@ jobs:
       - name: check if README matches MSRV defined here
         run: grep '1.56.1' src/core/README.md
 
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.8"
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install -e .
-
       - name: Check if it builds properly
         uses: actions-rs/cargo@v1
         with:
           command: build
+          args: --all-features
 
   check_cbindgen:
     name: "Check if cbindgen runs cleanly for generating the C headers"