small fixes

What's Changed

• Dev efm32 by @jp112sdl in #302
• Fix typo in README by @henrywiechert in #303
• add waitSerial to EFM32 by @jp112sdl in #304
• Radio RFM69 by @Nico9n in #305
• CRC Adressberechnung EFM32/ESP32/RP2040 by @jp112sdl in #306
• fix gh actions by @jp112sdl in #308
• add ci test for asksinsniffer by @jp112sdl in #309

Full Changelog: V5.0.2...V5.0.3