chore: remove MRSV from deny checks

Author: IvanChepurnyi

.github/workflows/rust-package.yml

@@ -65,4 +65,4 @@ jobs:
         with:
           command: check ${{ matrix.checks }}
           manifest-path: ./Cargo.toml
-          rust-version: ${{ env.MSRV }}
+          rust-version: nightly