add GitHub account for Niki (#2122)

Author: brandnerniki

shows/958 - 2025 Holiday Gift Guide.md

@@ -21,6 +21,7 @@ guest:
     of: Syntax
     url: https://syntax.fm
   - name: Niki Brandner
+    github: brandnerniki
     twitter: brandner_niki
     of: Syntax
     url: https://syntax.fm
@@ -105,4 +106,4 @@ Wes: [X](https://twitter.com/wesbos) [Instagram](https://www.instagram.com/wesbo
 
 Scott: [X](https://twitter.com/stolinski) [Instagram](https://www.instagram.com/stolinski/) [Tiktok](https://www.tiktok.com/@stolinski) [LinkedIn](https://www.linkedin.com/in/stolinski/) [Threads](https://www.threads.net/@stolinski)
 
-Randy: [X](https://twitter.com/randyrektor) [Instagram](https://www.instagram.com/randyrektor/) [YouTube](https://www.youtube.com/@randyrektor) [Threads](https://www.threads.net/@randyrektor)
+Randy: [X](https://twitter.com/randyrektor) [Instagram](https://www.instagram.com/randyrektor/) [YouTube](https://www.youtube.com/@randyrektor) [Threads](https://www.threads.net/@randyrektor)