gh-104773: PEP 594: Remove the mailcap module (#104867)

Remove Lib/test/mailcap.txt test file.

Author: vstinner

Doc/library/mailcap.rst

@@ -15,7 +15,6 @@ backwards compatibility. They have been superseded by other modules.
    chunk.rst
    crypt.rst
    imghdr.rst
-   mailcap.rst
    msilib.rst
    nis.rst
    nntplib.rst

Doc/library/superseded.rst

@@ -1737,7 +1737,7 @@ Modules
   +---------------------+---------------------+---------------------+---------------------+---------------------+
   | :mod:`!cgi`         | :mod:`imghdr`       | :mod:`nntplib`      | :mod:`spwd`         | :mod:`xdrlib`       |
   +---------------------+---------------------+---------------------+---------------------+---------------------+
-  | :mod:`!cgitb`       | :mod:`mailcap`      | :mod:`!ossaudiodev` | :mod:`!sunau`       |                     |
+  | :mod:`!cgitb`       | :mod:`!mailcap`     | :mod:`!ossaudiodev` | :mod:`!sunau`       |                     |
   +---------------------+---------------------+---------------------+---------------------+---------------------+
 
   (Contributed by Brett Cannon in :issue:`47061` and Victor Stinner in

Doc/whatsnew/3.11.rst

@@ -893,7 +893,7 @@ Modules (see :pep:`594`):
 * :mod:`chunk`
 * :mod:`crypt`
 * :mod:`imghdr`
-* :mod:`mailcap`
+* :mod:`!mailcap`
 * :mod:`msilib`
 * :mod:`nis`
 * :mod:`nntplib`

Doc/whatsnew/3.12.rst

@@ -164,6 +164,10 @@ Removed
 * :pep:`594`: Remove the :mod:`!sunau` module, deprecated in Python 3.11.
   (Contributed by Victor Stinner in :gh:`104773`.)
 
+* :pep:`594`: Remove the :mod:`!mailcap` module, deprecated in Python 3.11.
+  The :mod:`mimetypes` module provides an alternative.
+  (Contributed by Victor Stinner in :gh:`104773`.)
+
 
 Porting to Python 3.13
 ======================