oracle-instantclient: drop myself as a maintainer

I'm not personally connecting to Oracle Databases much these days.

pkgs/development/libraries/oracle-instantclient/default.nix

···
     sourceProvenance = with sourceTypes; [ binaryBytecode ];
     license = licenses.unfree;
     platforms = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" ];
-    maintainers = with maintainers; [ flokli dylanmtaylor ];
+    maintainers = with maintainers; [ dylanmtaylor ];
     hydraPlatforms = [ ];
   };
 }