Auto merge of #29375 - sagudev:wup, r=jdm

Warning instead of exception on unsupported Ubuntu

For someone who is always using latest stable Ubuntu version it is pretty annoying to change the script every time, so issuing a warning instead of error would still allow users on unsupported version to continue bootstrapping.

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- [x] These changes do not require tests because changes are in bootstrap script

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python/servo/bootstrap.py

@@ -250,7 +250,7 @@ def get_linux_distribution():
         distrib, version = 'Ubuntu', base_version
     elif distrib.lower() == 'ubuntu':
         if version > '22.04':
-            raise Exception('unsupported version of %s: %s' % (distrib, version))
+            print('WARNING: unsupported version of %s: %s' % (distrib, version))
     # Fixme: we should allow checked/supported versions only
     elif distrib.lower() not in [
         'centos',