pin toolchain for clippy to 1.76

Author: trappitsch

.github/workflows/build.yml

@@ -89,7 +89,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.52.1 # clippy is too much of a moving target at the moment
+          toolchain: 1.76 # clippy is too much of a moving target at the moment
           override: true
           components: clippy
       - uses: actions-rs/clippy-check@v1