Merge #21476: Unwrap fp in BytesParser so the file isn't unexpectedly closed.

diff --cc Misc/NEWS
index 1cd7d58ff05870c562bce82cbc4c2339bc3d8ea4,b5a5fa6f376764762ab370a3bcd16716a5d77937..880362f74944e872d64f7ffa5eb00ec422ae2b37
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -103,8 -27,9 +103,11 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #21476: Make sure the email.parser.BytesParser TextIOWrapper is
+   discarded after parsing, so the input file isn't unexpectedly closed.
+ 
 +- Issue #20295: imghdr now recognizes OpenEXR format images.
 +
  - Issue #21729: Used the "with" statement in the dbm.dumb module to ensure
    files closing.  Patch by Claudiu Popa.