Remove dtolnay's rust-toolchain action (#442)

* Remove dtolnay's rust-toolchain action

I believe our rust-toolchain.toml handles its use case exactly.

I don't believe this'll work, as it'd require rustup install a cargo stub
before any toolchain is installed, yet I want to confirm it doesn't.

* Place quotes around nightly toolchain version

* Put toolchain before options to resolve what appears to be a bug in rustup's help strings

* Add wasm32-unkknown-unknown to clippy workflow

.github/workflows/daily-deny.yml

@@ -17,11 +17,6 @@ jobs:
           path: ~/.cargo/advisory-db
           key: rust-advisory-db
 
-      - name: Install cargo
-        uses: dtolnay/rust-toolchain@5cb429dd810e16ff67df78472fa81cf760f4d1c0
-        with:
-          toolchain: 1.74.0
-
       - name: Install cargo deny
         run: cargo install --locked cargo-deny