mkdocs dependency needs an update

If I use mkdocs 1.2.1 (as required by docwriter), using python 3.9 fails with

  File "/usr/local/bin/mkdocs", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/__main__.py", line 183, in build_command
    build.build(config.load_config(**kwargs), dirty=not clean)
  File "/usr/local/lib/python3.9/site-packages/mkdocs/config/base.py", line 206, in load_config
    from mkdocs.config.defaults import get_schema
  File "/usr/local/lib/python3.9/site-packages/mkdocs/config/defaults.py", line 1, in <module>
    from mkdocs.config import config_options
  File "/usr/local/lib/python3.9/site-packages/mkdocs/config/config_options.py", line 8, in <module>
    from mkdocs import utils, theme, plugins
  File "/usr/local/lib/python3.9/site-packages/mkdocs/theme.py", line 6, in <module>
    from mkdocs.utils import filters
  File "/usr/local/lib/python3.9/site-packages/mkdocs/utils/filters.py", line 13, in <module>
    @jinja2.contextfilter
AttributeError: module 'jinja2' has no attribute 'contextfilter'

After enforcing an mkdocs update to 1.4.3 with

sudo python3.9 -m pip install --upgrade mkdocs

FreeType's make refdoc succeeds but issues the warning

INFO     -  DeprecationWarning: invalid escape sequence '\s'
              File "/usr/local/lib/python3.9/site-packages/jinja2/lexer.py", line 389, in __next__
                self.current = next(self._iter)
              File "/usr/local/lib/python3.9/site-packages/jinja2/lexer.py", line 650, in wrap
                self._normalize_newlines(value_str[1:-1])

Is this expected behaviour? In February, this didn't happen while preparing the last FreeType release. However, there were certainly Python updates for my openSUSE GNU/Linux box meanwhile...

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mkdocs dependency needs an update