Update CODEOWNERS: remove MSevey (celestiaorg#1972)

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## Overview
I don't think I should be a codeowner. 
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.github/CODEOWNERS

@@ -13,6 +13,6 @@
 # directory owners
 # NOTE: the directory owners should include the global owners unless the global
 # owner is fully deferring ownership to the directory owner
-docs @liamsi @adlerjohn @MSevey @evan-forbes @rootulp @cmwaters
-specs @liamsi @adlerjohn @MSevey @evan-forbes @rootulp @cmwaters
+docs @liamsi @adlerjohn @evan-forbes @rootulp @cmwaters
+specs @liamsi @adlerjohn @evan-forbes @rootulp @cmwaters
 x/qgb @SweeXordious @evan-forbes