Update repositories.txt (arduino#3719)

NicolasNewman · web-flow · commit 2488742bdb89 · 2023-12-08T16:32:51.000Z
diff --git a/repositories.txt b/repositories.txt
@@ -6463,3 +6463,4 @@ https://github.com/ArtronShop/ATD3.5-S3_Library
 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
