Maybe fix Rust action setup?

.forgejo/workflows/build.yaml

@@ -13,6 +13,7 @@ jobs:
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
         with:
+          toolchain: stable
           components: rustfmt
       - name: Check Rust formatting
         run: cargo fmt --all -- --check
@@ -26,6 +27,7 @@ jobs:
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
         with:
+          toolchain: stable
           components: clippy
       - name: Run Clippy
         run: cargo clippy -- -D warnings
@@ -38,6 +40,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
       - name: Check for Rust compilation errors
         run: cargo check
 
@@ -49,6 +53,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
       - name: Set up Python toolchain
         uses: actions/setup-python@v5
         with:
@@ -66,5 +72,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          toolchain: stable
       - name: Run Rust tests
         run: cargo test