chore: rename the codeowners contributor name (#3022)

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## Overview

I renamed my username :D 

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.github/CODEOWNERS

@@ -15,4 +15,4 @@
 # owner is fully deferring ownership to the directory owner
 docs @liamsi @adlerjohn @evan-forbes @rootulp @cmwaters
 specs @liamsi @adlerjohn @evan-forbes @rootulp @cmwaters
-x/blobstream @SweeXordious @evan-forbes
+x/blobstream @rach-id @evan-forbes