v6.0.2 Migrate to python-garminconnect

What's Changed

• fix: migrate from deprecated garth to python-garminconnect by @CableZa in #246
• fix: track TrainerRoad sync timestamp independently of Garmin by @longstone in #247
• fix: ci

New Contributors

• @CableZa made their first contribution in #246

Full Changelog: v5.3.2...v6.0.2