♻️ Maintenance update to upgrade used libraries

Changes

• 🐛 (from @simplynail in #25): fixing chart setup error with gca() call for recent Matplotlib versions
• 🙈 Add missing .gitignore
• 💥 Update dependencies + minimal Python version to 3.10 to work with latest releases 🏄
• 🎨 lint: Apply isort and prettier, and update typing
• 🎨 lint: Evolve pre-commit config with ruff
• 🍱 tests: Update SVG outputs from latest matplotlib
• 🐛 Fix saving PNG with transparent background, by swapping transparent=True with facecolor="none"
• 🗑️ Use psychrolib.GetTDryBulbFromMoistAirVolumeAndHumRatio, removing local method from here, now that it's included there
• 👷 ci: Swap travis CI config with GH actions to test + publish