Replace interface{} with any (#25686) (#25687)

Same perl replacement as https://github.com/go-gitea/gitea/pull/25686
but for 1.20 to ease future backporting.

routers/web/explore/topic.go

@@ -35,7 +35,7 @@ func TopicSearch(ctx *context.Context) {
 	}
 
 	ctx.SetTotalCountHeader(total)
-	ctx.JSON(http.StatusOK, map[string]interface{}{
+	ctx.JSON(http.StatusOK, map[string]any{
 		"topics": topicResponses,
 	})
 }