ci: remove nightly clippy

Closes #1212

.github/workflows/ci.yml

@@ -112,26 +112,6 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features --all-targets -- -D warnings
 
-  clippy-nightly:
-    name: Clippy (nightly)
-    timeout-minutes: 30
-    runs-on: ubuntu-latest
-    continue-on-error: true
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: nightly
-          components: clippy
-          override: true
-      - name: Run Clippy (nightly)
-        uses: actions-rs/clippy-check@v1
-        continue-on-error: true
-        with:
-          name: Clippy (nightly)
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features --all-targets -- -W clippy::all
-
   fmt:
     name: Rustfmt
     timeout-minutes: 30