Remove duplicate checkout and unused setup-python in docs workflow (#200)

Signed-off-by: Stefan VanBuren <svanburen@buf.build>

Author: stefanvanburen

.github/workflows/docs.yaml

@@ -31,10 +31,6 @@ jobs:
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-
-      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
-
       - uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
 
       - run: uv run --group docs --no-dev zensical build --clean