New version: KrylovKit v0.9.0

[JuliaRegistrator]

• Registering package: KrylovKit
• Repository: https://github.com/Jutho/KrylovKit.jl
• Created by: @Jutho
• Version: v0.9.0
• Commit: 3770d94991f00a65c7e377d52fdae6d3958d2a99
• Reviewed by: @Jutho
• Reference: Jutho/KrylovKit.jl@3770d94#commitcomment-151462554
• Description: Krylov methods for linear problems, eigenvalues, singular values and matrix functions
• Release notes:

* New function `lssolve` for least squares problems (using `LSMR` algorithm)
* New functions `reallinsolve` and `realeigsolve` for solving linear problems and eigenvalue problems with linear maps which are formulated in complex arithmetic, but are only linear with respect to real linear combinations (i.e. assume to be working in a real vector space irrespective of the scalar type)

## Breaking changes

- The verbosity system and the output formatting has been redesigned (both in the primal methods and the `rrule`s). The default verbosity level is now `1`, which means that warnings will be printed by default, but all other output (info messages) are suppressed. Before, the default verbosity was such that all output (including warnings) were suppressed.

[github-actions]

Hello, I am an automated registration bot. I help manage the registration process by checking your registration against a set of AutoMerge guidelines. If all these guidelines are met, this pull request will be merged automatically, completing your registration. It is strongly recommended to follow the guidelines, since otherwise the pull request needs to be manually reviewed and merged by a human.

1. AutoMerge Guidelines are all met! ✅

Your new version registration met all of the guidelines for auto-merging and is scheduled to be merged in the next round (~20 minutes).

2. To pause or stop registration

If you want to prevent this pull request from being auto-merged, simply leave a comment. If you want to post a comment without blocking auto-merging, you must include the text [noblock] in your comment.

Tip: You can edit blocking comments to add [noblock] in order to unblock auto-merging.