add release notes for v0.19.1

[grlee77]

Description

This is mostly fixes to wheels and some edge cases encountered in the tests on conda-forge, but we did resolve a couple unintentional backwards incompatibile changes.

Checklist

• Docstrings for all functions
• Gallery example in ./doc/examples (new features only)
• Benchmark in ./benchmarks, if your changes aren't covered by an
  existing benchmark
• Unit tests
• Clean style in the spirit of PEP8
• Descriptive commit messages (see below)

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  doc/release/release_dev.rst.

[psobolewskiPhD]

Line 4: We're happy to announce the release of scikit-image v0.19.01
I think you mean v0.19.1?

Also, on macOS 12, M1 python 3.9 and 3.10 wheels from:
https://github.com/grlee77/scikit-image/actions/runs/1557165043
seem fine:
python 3.9.7:
=========== 7152 passed, 41 skipped, 31 warnings in 74.89s (0:01:14) ===========
https://gist.github.com/psobolewskiPhD/25907a88515315e0c5998da8f860fcee

python 3.10.0:
=========== 7152 passed, 41 skipped, 31 warnings in 79.53s (0:01:19) ===========
https://gist.github.com/psobolewskiPhD/26c65900d6062e73b249ff3f1d3a8c13

[grlee77]

Thanks @psobolewskiPhD. Most of those are expected warnings, but there are a couple that should be easy to resolve and should have already been raising an error on CI! (we have one test matrix entry that is supposed to raise an error on any unexpected warnings, but clearly that did not happen)

[mkcor]

Do we want to wait for #6118 to be merged and/or #6093 to be decided upon to release v0.19.1? If not, I'm happy to approve.

[grlee77]

should be ready now. everything else tagged for 0.19.1 has been merged so once this is in I can kick off the release