Add RTC_DS1307_Library to repositories.txt (#5837)

Co-authored-by: Alejandro MezaE <[email protected]>

Author: mcu-electronics

repositories.txt

@@ -7725,3 +7725,4 @@ https://github.com/ridiculousfish/libdivide
 https://github.com/crozone-technology/TelegramESP32
 https://github.com/mawaeg/Arduino_RV-8523
 https://github.com/steins1997/arduino_uno_r4_minima_mcp2517fd
+https://github.com/mcu-electronics/RTC_DS1307_Library