tests/avocado: Replace assertRegexpMatches() for Python 3.12 compatibility

assertRegexpMatches() has been removed in Python 3.12 and should be replaced by
assertRegex(). See: https://docs.python.org/3.12/whatsnew/3.12.html#id3

Inspired-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231114144832.71612-1-philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

docs/devel/testing.rst

@@ -1016,7 +1016,7 @@ class.  Here's a simple usage example:
           self.vm.launch()
           res = self.vm.cmd('human-monitor-command',
                             command_line='info version')
-          self.assertRegexpMatches(res, r'^(\d+\.\d+\.\d)')
+          self.assertRegex(res, r'^(\d+\.\d+\.\d)')
 
 To execute your test, run:
 

tests/avocado/version.py

@@ -22,4 +22,4 @@ class Version(QemuSystemTest):
         self.vm.launch()
         res = self.vm.cmd('human-monitor-command',
                           command_line='info version')
-        self.assertRegexpMatches(res, r'^(\d+\.\d+\.\d)')
+        self.assertRegex(res, r'^(\d+\.\d+\.\d)')