Use tag to pin AsyncWebServer version

Author: willmmiles

platformio.ini

@@ -180,7 +180,7 @@ lib_deps =
     fastled/FastLED @ 3.6.0
     IRremoteESP8266 @ 2.8.2
     makuna/NeoPixelBus @ 2.7.5
-    https://github.com/Aircoookie/ESPAsyncWebServer.git @ ~2.0.7
+    https://github.com/Aircoookie/ESPAsyncWebServer.git#v2.2.1
   #For use of the TTGO T-Display ESP32 Module with integrated TFT display uncomment the following line
     #TFT_eSPI
   #For compatible OLED display uncomment following