fix: update gh username

I recently updated my GitHub username from DeveloperPaul123 to
ptsouchlos.

Author: ptsouchlos

blog/authors.yml

@@ -116,9 +116,9 @@ wusatosi:
 ptsou:
   name: Paul Tsouchlos
   title: Software Engineer // Open Source Enthusiast
-  url: https://github.com/DeveloperPaul123
+  url: https://github.com/ptsouchlos
   image_url: https://cdn.bsky.app/img/avatar/plain/did:plc:5gddchwhd754ni65bvx22eyf/bafkreicbieemdxbw3riqbxcgea7nf2he4fah6jnzn2bz4ado2ob74igyh4@jpeg
   page: true
   socials:
-    github: DeveloperPaul123
+    github: ptsouchlos
     bluesky: ptsou