Update references to Python's bug tracker.

Author: aaugustin

src/websockets/__main__.py

@@ -22,7 +22,7 @@ def win_enable_vt100() -> None:
         """
         Enable VT-100 for console output on Windows.
 
-        See also https://bugs.python.org/issue29059.
+        See also https://github.com/python/cpython/issues/73245.
 
         """
         import ctypes

src/websockets/legacy/protocol.py

@@ -1175,9 +1175,9 @@ def write_frame_sync(self, fin: bool, opcode: int, data: bytes) -> None:
 
     async def drain(self) -> None:
         try:
-            # drain() cannot be called concurrently by multiple coroutines:
-            # http://bugs.python.org/issue29930. Remove this lock when no
-            # version of Python where this bugs exists is supported anymore.
+            # drain() cannot be called concurrently by multiple coroutines.
+            # See https://github.com/python/cpython/issues/74116 for details.
+            # This workaround can be removed when dropping Python < 3.10.
             async with self._drain_lock:
                 # Handle flow control automatically.
                 await self._drain()

src/websockets/legacy/server.py

@@ -764,7 +764,8 @@ async def _close(self, close_connections: bool) -> None:
         self.server.close()
 
         # Wait until all accepted connections reach connection_made() and call
-        # register(). See https://bugs.python.org/issue34852 for details.
+        # register(). See https://github.com/python/cpython/issues/79033 for
+        # details. This workaround can be removed when dropping Python < 3.11.
         await asyncio.sleep(0)
 
         if close_connections: