Support for Sensirion SHT4x

variants/rak4631/platformio.ini

@@ -27,6 +27,7 @@ build_flags = ${nrf52_base.build_flags}
   -D ENV_INCLUDE_INA3221=1
   -D ENV_INCLUDE_INA219=1
   -D ENV_INCLUDE_INA260=1
+  -D ENV_INCLUDE_SHT4X=1
 build_src_filter = ${nrf52_base.build_src_filter}
   +<../variants/rak4631>
   +<helpers/sensors>
@@ -42,7 +43,8 @@ lib_deps =
   adafruit/Adafruit BMP280 Library @ ^2.6.8
   adafruit/Adafruit SHTC3 Library @ ^1.0.1
   adafruit/Adafruit INA260 Library @ ^1.5.3
-  sparkfun/SparkFun u-blox GNSS Arduino Library@^2.2.27
+  sparkfun/SparkFun u-blox GNSS Arduino Library @ ^2.2.27
+  sensirion/Sensirion I2C SHT4x @ ^1.1.2
 
 [env:RAK_4631_Repeater]
 extends = rak4631