Do not check msrv for feature zlib-rs

Author: NobodyXu

.github/workflows/main.yml

@@ -98,5 +98,4 @@ jobs:
       - run: cargo build --features zlib-default --no-default-features
       - run: cargo build --features zlib-ng-compat --no-default-features
       - run: cargo build --features zlib-ng --no-default-features
-      - run: cargo build --features zlib-rs --no-default-features
       - run: cargo build --features cloudflare_zlib --no-default-features