Update tests to support file 5.46. (Closes: #395)

tests/data/quine_expected_diff

 @@ -1 +1 @@
 -gzip compressed data, was "recursive", from FAT filesystem (MS-DOS, OS/2, NT)
-+Zip archive data, at least v2.0 to extract, compression method=deflate
++Zip archive data, made by v2.0, extract using at least v2.0, last modified, last modified Sun, Mar 04 2010 00:24:16, uncompressed size 440, method=deflate

tests/test_quines.py

@@ -54,7 +54,7 @@ def differences(quine1, quine2):
     return quine1.compare(quine2).details
 
 
-@skip_unless_file_version_is_at_least("5.45")
+@skip_unless_file_version_is_at_least("5.46")
 def test_difference(differences):
     assert_diff(differences[0], "quine_expected_diff")