fix: missing dependency

Author: recrof

variants/lilygo_tlora_v2_1/platformio.ini

@@ -42,6 +42,7 @@ lib_deps =
   adafruit/Adafruit INA219 @ ^1.2.3
   adafruit/Adafruit AHTX0 @ ^2.0.5
   adafruit/Adafruit BME280 Library @ ^2.3.0
+  adafruit/Adafruit BMP280 Library @ ^2.6.8
 
 ; === LILYGO T-LoRa V2.1-1.6 with SX1276 environments ===
 [env:LilyGo_TLora_V2_1_1_6_Repeater]