patch 9.0.1689: python 3.12 produces warnings and fails test

Problem: python 3.12 produces warnings and fails test
Solution: Make use of raw strings in python3 tests

closes: #12765

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Zdenek Dohnal <zdohnal@redhat.com>

src/testdir/test_python3.vim

@@ -22,10 +22,10 @@ func Test_AAA_python3_setup()
     import sys
     import re
 
-    py33_type_error_pattern = re.compile('^__call__\(\) takes (\d+) positional argument but (\d+) were given$')
+    py33_type_error_pattern = re.compile(r'^__call__\(\) takes (\d+) positional argument but (\d+) were given$')
     py37_exception_repr = re.compile(r'([^\(\),])(\)+)$')
-    py39_type_error_pattern = re.compile('\w+\.([^(]+\(\) takes)')
-    py310_type_error_pattern = re.compile('takes (\d+) positional argument but (\d+) were given')
+    py39_type_error_pattern = re.compile(r'\w+\.([^(]+\(\) takes)')
+    py310_type_error_pattern = re.compile(r'takes (\d+) positional argument but (\d+) were given')
 
     def emsg(ei):
       return ei[0].__name__ + ':' + repr(ei[1].args)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1689,
 /**/
     1688,
 /**/