bump version to v2.11.0

* update the changelog
* update author list

Tagging 2.10.1

build on macos-latest; set mac deployment

bump version to v2.10.0a0

add sphinx-multiversion to conf.py

Tagging 2.9.2

Tagging 2.9.1

Tagging 2.9.0

update version in the banner for the docs

[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci