[CODEOWNERS] Remove invalid account (Azure#46970)

The focus of these changes is to remove an invalid account exposed by a linter run failure.

Author: jsquire

.github/CODEOWNERS

@@ -897,10 +897,10 @@
 # ServiceOwners:                                                   @shahbj79 @mit2nil @aygoya @ganganarayanan
 
 # PRLabel: %Synapse
-/sdk/synapse/                                                      @wonner @yanjungao718 @annelo-msft
+/sdk/synapse/                                                      @yanjungao718 @annelo-msft
 
 # ServiceLabel: %Synapse
-# ServiceOwners:                                                   @wonner @yanjungao718
+# ServiceOwners:                                                   @yanjungao718
 
 # PRLabel: %Tables
 /sdk/tables/                                                       @christothes @JonathanCrd