Retire @duyguisler as a Turkish reviewer (#1880)

Thanks for the work so far, feel free to come back if you have more
time!

.github/CODEOWNERS

@@ -13,7 +13,7 @@ po/ko.po @jiyongp @jooyunghan @namhyung
 po/pl.po @jkotur @dyeroshenko
 po/pt-BR.po @rastringer @hugojacob @henrif75 @joaovicmendes @jcvicelli @azevedoalice
 po/ru.po @istolga @baltuky @zvonden @dyeroshenko
-po/tr.po @duyguisler @enes1313
+po/tr.po @enes1313
 po/uk.po @dyeroshenko
 po/zh-CN.po @suetfei @wnghl @anlunx @kongy @noahdragon @superwhd @emmali01 @SketchK @candysonya @AgainstEntropy
 po/zh-TW.po @edong @hueich @kuanhungchen @victorhsieh @mingyc @johnathan79717