rfm69: fix warning when building

code/platformio.ini

@@ -148,7 +148,7 @@ lib_deps =
     PZEM004T
     PubSubClient
     https://github.com/1technophile/rc-switch#11402652
-    https://github.com/LowPowerLab/RFM69#7db941d3
+    https://github.com/LowPowerLab/RFM69#adc94d2d
     https://github.com/mcspr/rpnlib.git#0.24.1
     NewPing
     https://github.com/sparkfun/SparkFun_VEML6075_Arduino_Library#V_1.0.3