bpo-27313: Use non-deprecated methods for tracing (GH-29425) (GH-29451)

bpo-27313: Use non-deprecated methods for tracing (GH-29425) (GH-29451) · python/cpython@376218e

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Original file line number	Diff line number	Diff line change
`@@ -307,14 +307,14 @@ def test_trace_variable(self):`
`307`	`307`	`items = ('a', 'b', 'c')`
`308`	`308`	`textvar = tkinter.StringVar(self.root)`
`309`	`309`	`def cb_test(*args):`
`310`		`-self.assertEqual(textvar.get(), items[1])`
`311`		`-success.append(True)`
	`310`	`+success.append(textvar.get())`
`312`	`311`	`optmenu = ttk.OptionMenu(self.root, textvar, "a", *items)`
`313`	`312`	`optmenu.pack()`
`314`		`-cb_name = textvar.trace("w", cb_test)`
	`313`	`+cb_name = textvar.trace_add("write", cb_test)`
`315`	`314`	`optmenu['menu'].invoke(1)`
`316`		`-self.assertEqual(success, [True])`
`317`		`-textvar.trace_vdelete("w", cb_name)`
	`315`	`+self.assertEqual(success, ['b'])`
	`316`	`+self.assertEqual(textvar.get(), 'b')`
	`317`	`+textvar.trace_remove("write", cb_name)`
`318`	`318`	`optmenu.destroy()`
`319`	`319`
`320`	`320`