Rust 1.74

Adds a Rust toolchain file to be less disruptive to developers who don't keep
their toolchain synchronized (by now having rustup automatically synchronize).

Hopefully helps resolve how +nightly clippy may pass for the coordinator, yet
building would fail due to stable's (hopefully prior?) failure to model some
async functions re: Send/Sync.

Also adds rust-src as a component in preparation of
https://github.com/paritytech/polkadot-sdk/pull/2217

.github/workflows/daily-deny.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install cargo
         uses: dtolnay/rust-toolchain@5cb429dd810e16ff67df78472fa81cf760f4d1c0
         with:
-          toolchain: 1.73.0
+          toolchain: 1.74.0
 
       - name: Install cargo deny
         run: cargo install --locked cargo-deny

.github/workflows/lint.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           rust-toolchain: ${{ steps.nightly.outputs.version }}
-          rust-components: clippy
+          rust-components: rust-src, clippy
 
       - name: Run Clippy
         run: cargo clippy --all-features --all-targets -- -D warnings -A clippy::items_after_test_module
@@ -41,7 +41,7 @@ jobs:
       - name: Install cargo
         uses: dtolnay/rust-toolchain@5cb429dd810e16ff67df78472fa81cf760f4d1c0
         with:
-          toolchain: 1.73.0
+          toolchain: 1.74.0
 
       - name: Install cargo deny
         run: cargo install --locked cargo-deny