Remove compatibility aliases (#5464)

* Remove compatibility aliases

Remove a few instances of Text

Use aliases from _typeshed

* Remove unused imports

stdlib/poplib.pyi

@@ -1,6 +1,6 @@
 import socket
 import ssl
-from typing import Any, BinaryIO, Dict, List, Optional, Pattern, Text, Tuple, overload
+from typing import Any, BinaryIO, Dict, List, Optional, Pattern, Tuple, overload
 
 _LongResp = Tuple[bytes, List[bytes], int]
 
@@ -13,17 +13,17 @@ LF: bytes
 CRLF: bytes
 
 class POP3:
-    encoding: Text
-    host: Text
+    encoding: str
+    host: str
     port: int
     sock: socket.socket
     file: BinaryIO
     welcome: bytes
-    def __init__(self, host: Text, port: int = ..., timeout: float = ...) -> None: ...
+    def __init__(self, host: str, port: int = ..., timeout: float = ...) -> None: ...
     def getwelcome(self) -> bytes: ...
     def set_debuglevel(self, level: int) -> None: ...
-    def user(self, user: Text) -> bytes: ...
-    def pass_(self, pswd: Text) -> bytes: ...
+    def user(self, user: str) -> bytes: ...
+    def pass_(self, pswd: str) -> bytes: ...
     def stat(self) -> Tuple[int, int]: ...
     def list(self, which: Optional[Any] = ...) -> _LongResp: ...
     def retr(self, which: Any) -> _LongResp: ...
@@ -32,25 +32,25 @@ class POP3:
     def rset(self) -> bytes: ...
     def quit(self) -> bytes: ...
     def close(self) -> None: ...
-    def rpop(self, user: Text) -> bytes: ...
-    timestamp: Pattern[Text]
-    def apop(self, user: Text, password: Text) -> bytes: ...
+    def rpop(self, user: str) -> bytes: ...
+    timestamp: Pattern[str]
+    def apop(self, user: str, password: str) -> bytes: ...
     def top(self, which: Any, howmuch: int) -> _LongResp: ...
     @overload
     def uidl(self) -> _LongResp: ...
     @overload
     def uidl(self, which: Any) -> bytes: ...
     def utf8(self) -> bytes: ...
-    def capa(self) -> Dict[Text, List[Text]]: ...
+    def capa(self) -> Dict[str, List[str]]: ...
     def stls(self, context: Optional[ssl.SSLContext] = ...) -> bytes: ...
 
 class POP3_SSL(POP3):
     def __init__(
         self,
-        host: Text,
+        host: str,
         port: int = ...,
-        keyfile: Optional[Text] = ...,
-        certfile: Optional[Text] = ...,
+        keyfile: Optional[str] = ...,
+        certfile: Optional[str] = ...,
         timeout: float = ...,
         context: Optional[ssl.SSLContext] = ...,
     ) -> None: ...