Remove clippy from CI

This is a stable branch, where the churn of adapting to new clippy
lints isn't justified.

.github/workflows/rust.yml

@@ -50,26 +50,11 @@ jobs:
           profile: minimal
           toolchain: stable
           override: true
-          components: rustfmt, clippy
+          components: rustfmt
       - uses: actions-rs/cargo@v1
         with:
           command: fmt
           args: --all -- --check
-      - uses: actions-rs/cargo@v1
-        if: always()
-        with:
-          command: clippy
-          args: --all-targets -- -D warnings
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: clippy
-      - name: lint fuzz
-        run: |
-          cd fuzz
-          cargo clippy -- -D warnings
 
   audit:
     runs-on: ubuntu-latest