gh-62824: Adjust test_alias_modules_exist test to allow .pyc codec files

In Fedora, we install many codecs as .pyc files to save space.

This test was failing when running from installed Python:

    ======================================================================
    FAIL: test_alias_modules_exist (test.test_codecs.TransformCodecTest.test_alias_modules_exist)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/usr/lib64/python3.14/test/test_codecs.py", line 3115, in test_alias_modules_exist
        self.assertTrue(os.path.isfile(codec_file),
        ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                        "Codec file not found: " + codec_file)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    AssertionError: False is not true : Codec file not found: /usr/lib64/python3.14/encodings/cp037.py

    ----------------------------------------------------------------------

Author: hroncok

Lib/test/test_codecs.py

@@ -3112,7 +3112,9 @@ def test_alias_modules_exist(self):
         encodings_dir = os.path.dirname(encodings.__file__)
         for value in encodings.aliases.aliases.values():
             codec_file = os.path.join(encodings_dir, value + ".py")
-            self.assertTrue(os.path.isfile(codec_file),
+            pyc_file = codec_file + "c"
+            self.assertTrue(os.path.isfile(codec_file)
+                            or os.path.isfile(pyc_file),
                             "Codec file not found: " + codec_file)
 
     def test_quopri_stateless(self):