Upgrade docker image & clang-format

• Docker image updated to Ubuntu 22.04LTS
• Clang-format is now clang-format-14 (the default version from Ubuntu 22.04). With this new version, lambdas are sometimes badly indented => this has been fixed.

requested review from @acrovato

assigned to @rboman

Are you ok with breaking lines in lambdas like this:

tbb::parallel_for_each(
  mat->tag->elems.begin(), mat->tag->elems.end(),
  [&](Element *e)
  {
    ...
  }
);

instead of

tbb::parallel_for_each(mat->tag->elems.begin(), mat->tag->elems.end(), [&](Element *e)
{
  ...
});

This is a little less compact... but I have not found a way to add a specific rule in clang-format.

If it is okay for you, then it is fine for me.

approved this merge request

merged

mentioned in commit 97b06f41

resolved all threads