switch to tzapu/WiFiManager#1740 until merged to resolve build warnings

Author: zivillian

platformio.ini

@@ -15,7 +15,7 @@
     platform = espressif32
     framework = arduino
     lib_deps = 
-        https://github.com/tzapu/WiFiManager.git
+        https://github.com/PBRunot/WiFiManager.git#0404abde0d9d2da5c09be7d0cc669b1188bb1c81
         https://github.com/me-no-dev/ESPAsyncWebServer.git
         https://github.com/eModbus/eModbus.git#ed343224827600409e4d57e77e60b73ff9c22f1a
         SPI