Improve a few version-dependent tkinter functions (#9637)

stdlib/_tkinter.pyi

@@ -107,15 +107,29 @@ TK_VERSION: str
 class TkttType:
     def deletetimerhandler(self): ...
 
-def create(
-    __screenName: str | None = ...,
-    __baseName: str | None = ...,
-    __className: str = ...,
-    __interactive: bool = ...,
-    __wantobjects: bool = ...,
-    __wantTk: bool = ...,
-    __sync: bool = ...,
-    __use: str | None = ...,
-): ...
+if sys.version_info >= (3, 8):
+    def create(
+        __screenName: str | None = None,
+        __baseName: str = "",
+        __className: str = "Tk",
+        __interactive: bool = False,
+        __wantobjects: bool = False,
+        __wantTk: bool = True,
+        __sync: bool = False,
+        __use: str | None = None,
+    ): ...
+
+else:
+    def create(
+        __screenName: str | None = None,
+        __baseName: str | None = None,
+        __className: str = "Tk",
+        __interactive: bool = False,
+        __wantobjects: bool = False,
+        __wantTk: bool = True,
+        __sync: bool = False,
+        __use: str | None = None,
+    ): ...
+
 def getbusywaitinterval(): ...
 def setbusywaitinterval(__new_val): ...