chore: switch AWS SDK to up-to-date HTTPS stack to reduce duplicated dependencies

- Update cargo-deny installation to use latest version
- Remove legacy `rustls` feature that enabled the old TLS stack (hyper 0.14 + rustls 0.21 + ring)
- Enable only `default-https-client` and `rt-tokio` to use the new default SDK configuration

Author: Craig Qian

.github/workflows/rust.yml

@@ -42,5 +42,5 @@ jobs:
       - run: cargo build --features ${{ matrix.features }} ${{ matrix.additional_flags }} --locked
       - run: cargo clippy --features ${{ matrix.features }} ${{ matrix.additional_flags }} --locked -- -D warnings --no-deps
       - run: cargo fmt -- --check
-      - run: cargo install --version 0.14.24 cargo-deny --locked
+      - run: cargo install cargo-deny --locked
       - run: cargo deny --features ${{ matrix.features }} --no-default-features check --disable-fetch licenses bans sources