v9.0.0 release

[Mati365]

Suggested merge commit message (convention)

Internal: Changelog for v9.0.0.

[Mati365]

@pomek Should we include changelog from alpha?

Needs to be released after @Witoso approval

[coveralls]

Pull Request Test Coverage Report for Build 87ae5e3c-87fe-441d-9d6d-bd8c03ec1d29

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 017974c1-04bc-42f3-8428-986f3b83539e:	0.0%
Covered Lines:	159
Relevant Lines:	159

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💛 - Coveralls

[Witoso]

IMHO, we should keep the version of TS aligned with the version of TS used by the editor.

Switched compiler from TypeScript `4.x` to `5.x` to ensure compatibility with the newest CKEditor 5 packages.

The editor uses 5.0 AFAIR. Have we bumped to 5.1? I know TS is not using semver, but I'm afraid the higher we go w/o testing, the less compatibility we could have with other environments. 5.0 is already battle-tested by the editor, and I'd sleep better.

[Mati365]

Ok 👍 I'd try downgrade.

[Mati365]

@Witoso Downgraded, looks ok.

[Witoso]

We have it pinned in the editor, not sure why:

typescript": "5.0.4",

@filipsobol?

[Mati365]

@Witoso It's due to ~ prefix in typescript package version. It enforces the newest patch version.

[Witoso]

I know, I just wonder should we pin it exactly like ckeditor5, not sure.

[pomek]

Once the PR is merged, please ping @psmyrek / @martnpaneq to process the publishing process.