Jinja2 3.0 compatibility
Some of the CI jobs install jinja2 via pip and thus use the recently-released jinja2 3.0.0. in !452 (merged), we are thus seeing
File "/builds/walberla/walberla/python/pystencils_walberla/kernel_selection.py", line 111, in get_code true_branch_code = do_indent(true_branch_code, width=4, indentfirst=True) TypeError: do_indent() got an unexpected keyword argument 'indentfirst'
indentfirst has been deprecated sind 2.10 three years ago and was removed in 3.0.0, see https://github.com/pallets/jinja/commit/b0015c72d5acbf93b9d99a1ce6167889338db85b. Its usage was introduced into Walberla by @da15siwa in !446 (merged) two weeks ago.