chore(deps): update python docker tag to v3.14 (#460)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile.landcover

@@ -1,7 +1,7 @@
 # One-shot bake image. Run via `docker compose --profile bake run --rm landcover-bake`.
 # Kept separate from the prod image to keep that image lean. rasterio ships GDAL
 # wheels on PyPI, so no system GDAL install is needed.
-FROM python:3.12-slim
+FROM python:3.14-slim
 
 WORKDIR /app