This is a minor release bringing over some changes from the latest development branch.

Example Configurations for many machines are posted at: https://github.com/MarlinFirmware/Configurations/tree/release-2.1.0.4

Changes

• 🔨 Specify versions in INI
• 👔 Update .gitignore
• 🐛 Fix RAMPS AUX1 RX/TX pins (#27745)
• 🐛 Fix Hotend > 0 Preheat (#27932)
• 🐛 Fix Teensy 4.x stepper timing (#28169)
• 🐛 Fix TFT LVGL UI + Y-DIR conflict (#28291)

Full Changelog: https://github.com/MarlinFirmware/Marlin/compare/2.1.0.1...2.1.0.4