ci: pin uv to 0.10.2 and bump devcontainer Python to 3.12

- publish-pypi.yml: uv 0.9.13 -> 0.10.2 so the published artifact is
  built with the same uv as CI (Greptile)
- devcontainer: pin floating uv:latest -> uv:0.10.2 (Greptile)
- devcontainer: Python base 3.9 -> 3.12; a 3.9 devcontainer can't install
  the package now that requires-python is >=3.12

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: max-parke-scale

.devcontainer/Dockerfile

@@ -1,8 +1,8 @@
-ARG VARIANT="3.9"
+ARG VARIANT="3.12"
 FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
 
 USER vscode
 
-COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+COPY --from=ghcr.io/astral-sh/uv:0.10.2 /uv /uvx /bin/
 
 RUN echo "[[ -d .venv ]] && source .venv/bin/activate || export PATH=\$PATH" >> /home/vscode/.bashrc

.github/workflows/publish-pypi.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@d4b2f3b6ecc6e67c4457f6d3e41ec42d3d0fcb86 # v5.4.2
         with:
-          version: '0.9.13'
+          version: '0.10.2'
 
       - name: Publish to PyPI
         run: |