fix ci workflow warnings (#70)

Signed-off-by: Nico Wagner <[email protected]>

Author: nwagner84

.github/workflows/ci.yml

@@ -18,10 +18,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
-            toolchain: ${{ matrix.rust }}
-            override: true
+          toolchain: ${{ matrix.rust }}
       - name: Build the code
         run: cargo build --verbose
       - name: Test the code
@@ -31,9 +30,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            override: true
+        uses: dtolnay/rust-toolchain@stable
       - name: Check formatting
         run: cargo fmt --check