[RTL_433] Update rtl_433_ESP library to v0.5.1 (#2328)

Updates the NorthernMan54/rtl_433_ESP dependency from v0.5.0 to v0.5.1,
which guards vdata_make() against strdup(NULL) for DATA_FORMAT.


Co-authored-by: Claude <noreply@anthropic.com>

platformio.ini

@@ -156,7 +156,7 @@ smartrc-cc1101-driver-lib = https://github.com/LSatan/SmartRC-CC1101-Driver-Lib/
 stl = https://github.com/mike-matera/ArduinoSTL/archive/7411816.zip
 shtc3 = https://github.com/sparkfun/SparkFun_SHTC3_Arduino_Library/archive/671ef7e.zip
 somfy_remote=Somfy_Remote_Lib@0.3.0
-rtl_433_ESP = https://github.com/NorthernMan54/rtl_433_ESP/archive/v0.5.0.zip
+rtl_433_ESP = https://github.com/NorthernMan54/rtl_433_ESP/archive/v0.5.1.zip
 emodbus =  miq19/eModbus@1.0.0
 gfSunInverter = https://github.com/BlackSmith/GFSunInverter/archive/v1.0.1.zip
 decoder = https://github.com/theengs/decoder/archive/development.zip