Fix typo in comment (GH-26162)

Lib/gzip.py

@@ -521,7 +521,7 @@ class _GzipReader(_compression.DecompressReader):
 
     def _read_eof(self):
         # We've read to the end of the file
-        # We check the that the computed CRC and size of the
+        # We check that the computed CRC and size of the
         # uncompressed data matches the stored values.  Note that the size
         # stored is the true file size mod 2**32.
         crc32, isize = struct.unpack("<II", self._read_exact(8))