Merge branch `release/1.1` to `main`

This merges all changes in the recently shipped 1.1.0 release to the main development branch of this package.

[X] I've read the Contribution Guidelines
[X] My contributions are licensed under the Swift license.
[X] I've followed the coding style of the rest of the project.
[ ] I've added tests covering all new code paths my change adds to the project (if appropriate).
[ ] I've added benchmarks covering new functionality (if appropriate).
[ ] I've verified that my change does not break any existing tests or introduce unexplained benchmark regressions.
[ ] I've updated the documentation if necessary.

apple / swift-collections