fix: docker build failure (python-gdal version mismatch)

[tringuyen-yw]

SUMMARY

main at 807db62 (2026-07-28) failed docker build

Exception: Python bindings of GDAL 3.13.1 require at least libgdal 3.13.1, but 3.10.3 was found

Cause of Failure

The backend Dockerfile uses the python:3.12-slim base image, which installs the system package libgdal-dev at version 3.10.3. However, the Python package gdal was locked to 3.13.1 in poetry.lock.

This PR update pyproject.toml to restrict the Python gdal package dependency constraint to match the base image library gdal (>=3.10.3,<3.11.0)

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