dem-stitcher v2.5.9

Added

• Uses ruff exclusively for linting and formatting following OPERA/ARIA linting standards from DIST-S1.
• Added geoid_path to stitch_dem to allow for user to specify geoid path. If None, then default geoid is used.
• Added UserWarning when geoid file does not cover the dateline.

Changed

• Updated geoid.py to use the new geoid path for egm08 with 1 arc-second resolution.
• Library is in src directory per: https://packaging.python.org/en/latest/discussions/src-layout-vs-flat-layout/
  • Helps with Ruff, too.

Fixed

• Allows users to bring their own geoid data as noted here.
• Ruff linting and docstring issues using the new ruff configuration
• Updates test action workflow with micromamba action.

Removed

• Removed explicit flake8 action (should be handled by ruff).