Update repositories.txt (#3726)

PU2REO · web-flow · commit 92436efbaf2b · 2023-12-09T19:42:06.000Z
diff --git a/repositories.txt b/repositories.txt
@@ -6468,3 +6468,4 @@ https://github.com/s-light/slight_mapping
 https://github.com/s-light/slight_easing
 https://github.com/AlfredoSystems/PestoLink-Receive
 https://github.com/NicolasNewman/ArgParse
+https://github.com/PU2REO/Si5351ArduinoLite
