Update repositories.txt (#6999)

Author: dejwk

repositories.txt

@@ -2167,6 +2167,7 @@ https://github.com/DefProc/somo-ii-lib
 https://github.com/DeimosHall/RP2040_CPU_Temperature.git
 https://github.com/DEIS-Tools/CLAIRE-library
 https://github.com/dejwk/roo_backport
+https://github.com/dejwk/roo_blink
 https://github.com/dejwk/roo_collections
 https://github.com/dejwk/roo_control
 https://github.com/dejwk/roo_display