Update repositories.txt - Library name change for Alfredo_NoU3

I'm the maintainer for this library. I am about to start distributing the board that this library is written for, and it is gonna bug me forever if this isn't fixed before the community that uses my board starts using this library. Thank you!

Author: SaintSampo

repositories.txt

@@ -627,7 +627,7 @@ https://github.com/alextaujenis/RBD_Timer
 https://github.com/alextaujenis/RBD_WaterSensor
 https://github.com/AlexTutorial/KrokoTS
 https://github.com/AlfredoMunguia/TinyGuixhe
-https://github.com/AlfredoSystems/Alfredo_NoU3
+https://github.com/AlfredoSystems/Alfredo-NoU3
 https://github.com/AlfredoSystems/Alfredo-NoU2
 https://github.com/AlfredoSystems/AlfredoConnect-Receive
 https://github.com/AlfredoSystems/AlfredoCRSF