Fix cargo clippy workflow.

.github/workflows/rust-clippy.yml

@@ -15,8 +15,6 @@ on:
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [ "dev" ]
-  schedule:
-    - cron: '44 22 * * 5'
 
 jobs:
   rust-clippy-analyze:
@@ -33,7 +31,7 @@ jobs:
         uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af #@v1
         with:
           profile: minimal
-          toolchain: stable
+          toolchain: nightly
           components: clippy
           override: true