patch 9.1.1343: filetype: IPython files are not recognized

Problem:  filetype: IPython files are not recognized
          (user202729)
Solution: detect *.ipy files as python filetype

fixes: #17163

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_filetype.vim

@@ -632,7 +632,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     pymanifest: ['MANIFEST.in'],
     pyret: ['file.arr'],
     pyrex: ['file.pyx', 'file.pxd', 'file.pxi', 'file.pyx+'],
-    python: ['file.py', 'file.pyw', '.pythonstartup', '.pythonrc', '.python_history', '.jline-jython.history', 'file.ptl', 'file.pyi', 'SConstruct'],
+    python: ['file.py', 'file.pyw', '.pythonstartup', '.pythonrc', '.python_history', '.jline-jython.history', 'file.ptl', 'file.pyi', 'SConstruct', 'file.ipy'],
     ql: ['file.ql', 'file.qll'],
     qml: ['file.qml', 'file.qbs'],
     qmldir: ['qmldir'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1343,
 /**/
     1342,
 /**/