use github's interpolation to be windows compatible

.github/workflows/build.yml

@@ -71,13 +71,13 @@ jobs:
           override: true
 
       - name: build and lint with clippy
-        run: cargo clippy --features ${DEFAULT_FEATURES} --tests
+        run: cargo clippy --features ${{ env.DEFAULT_FEATURES }} --tests
 
       - name: Spot-check build for native-tls features
         run: cargo clippy --no-default-features --features azure,datafusion,s3-native-tls,gcs,glue --tests
 
       - name: Check docs
-        run: cargo doc --features ${DEFAULT_FEATURES }
+        run: cargo doc --features ${{ env.DEFAULT_FEATURES }}
 
       - name: Check no default features (except rustls)
         run: cargo check --no-default-features --features rustls
@@ -108,7 +108,7 @@ jobs:
           override: true
 
       - name: Run tests
-        run: cargo test --verbose --features ${DEFAULT_FEATURES}
+        run: cargo test --verbose --features ${{ env.DEFAULT_FEATURES }}
 
   integration_test:
     name: Integration Tests
@@ -158,7 +158,7 @@ jobs:
 
       - name: Run tests with rustls (default)
         run: |
-          cargo test --features integration_test,${DEFAULT_FEATURES}
+          cargo test --features integration_test,${{ env.DEFAULT_FEATURES }}
 
       - name: Run tests with native-tls
         run: |