ci: bump action versions — checkout@v6, setup-uv@v7, setup-python@v6

Author: larsrollik

.github/workflows/pr-review.yml

@@ -20,7 +20,7 @@ jobs:
   #   name: Claude PR review
   #   runs-on: ubuntu-latest
   #   steps:
-  #     - uses: actions/checkout@v4
+  #     - uses: actions/checkout@v6
   #       with:
   #         fetch-depth: 0
   #
@@ -64,7 +64,7 @@ jobs:
   #   name: Ollama PR review
   #   runs-on: self-hosted
   #   steps:
-  #     - uses: actions/checkout@v4
+  #     - uses: actions/checkout@v6
   #       with:
   #         fetch-depth: 0
   #