[noble] FTBFS on failure in test vlog - Python3, change of behavior in Python 3.13, backported to 3.12 and 3.11

Full log: https://launchpadlibrarian.net/723457197/buildlog_ubuntu-noble-arm64.openvswitch_3.3.0-1build2_BUILDING.txt.gz

ERROR: 1 test was run,
1 failed unexpectedly.

## ------------------------ ##
## Summary of the failures. ##
## ------------------------ ##
Failed tests:
openvswitch 3.3.0 test suite test groups:

 NUM: FILE-NAME:LINE TEST-GROUP-NAME
      KEYWORDS

 2531: vlog.at:3 vlog - Python3

## ---------------------- ##
## Detailed failed tests. ##
## ---------------------- ##

# -*- compilation -*-
2531. vlog.at:3: testing vlog - Python3 ...
../../tests/vlog.at:6: $PYTHON3 $srcdir/test-vlog.py --log-file log_file \
-v dbg module_1:info module_2:warn syslog:off 2>stderr_log
../../tests/vlog.at:9: sed -e 's/.*-.*-.*T..:..:..Z |//' \
-e 's/File ".*", line [0-9][0-9]*,/File <name>, line <number>,/' \
stderr_log
--- - 2024-04-06 13:05:02.236874405 +0000
+++ /<<PKGBUILDDIR>>/_debian/tests/testsuite.dir/at-groups/2531/stdout 2024-04-06 13:05:02.210940554 +0000
@@ -7,31 +7,37 @@
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   6 | module_0 | ERR | error exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   7 | module_0 | WARN | warn exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   8 | module_0 | INFO | information exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   9 | module_0 | DBG | debug exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   10 | module_0 | ERR | exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   11 | module_1 | EMER | emergency
   12 | module_1 | ERR | error
@@ -41,26 +47,31 @@
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   17 | module_1 | ERR | error exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   18 | module_1 | WARN | warn exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   19 | module_1 | INFO | information exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   21 | module_1 | ERR | exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   22 | module_2 | EMER | emergency
   23 | module_2 | ERR | error
@@ -69,20 +80,24 @@
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   28 | module_2 | ERR | error exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   29 | module_2 | WARN | warn exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError
   32 | module_2 | ERR | exception
 Traceback (most recent call last):
   File <name>, line <number>, in main
     assert fail
+ ^^^^
 AssertionError