Fix Python steps in build job

.forgejo/workflows/build.yaml

@@ -49,10 +49,11 @@ jobs:
         uses: actions/checkout@v4
       - name: Set up Rust
         uses: https://github.com/actions-rust-lang/setup-rust-toolchain@v1
-      - name: Set up Python
+      - name: Set up Python toolchain
         uses: actions/setup-python@v5
         with:
           python-version: 3.13.2
+      - name: Set up Python environment
         run: pip install -r requirements.txt
       - name: Build Rust code
         run: maturin develop