docs: announce 3.9

[profanis]

WIP

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/ngxs/store/blob/master/CONTRIBUTING.md#commit
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[nx-cloud[bot]]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit de99dad3fd0c33cc22deb32c5fd161f51969a956. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

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✅ Successfully ran 3 targets

• nx run-many --target=test --all --configuration=ci --maxWorkers=4
• nx run-many --target=lint --all
• nx run-many --target=build --all

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[bundlemon[bot]]

BundleMon (Integration Projects)

Unchanged files (2)

Status	Path	Size	Limits
:white_check_mark:	Main bundles(Gzip) hello-world-ng17/dist-integration/main.(hash) .js	68.5KB	+1%
:white_check_mark:	Main bundles(Gzip) hello-world-ng16/dist-integration/main.(hash) .js	67.03KB	+1%

No change in files bundle size

Final result: :white_check_mark:

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[nx-cloud[bot]]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 370ea7f6f395cd2f3e06914f17d7384aa9f4667a. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

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---

✅ Successfully ran 4 targets

• nx run-many --target=lint --all
• nx run-many --target=test --all --configuration=ci --maxWorkers=4
• nx lint-types store
• nx run-many --target=build --all

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[qlty-cloud-legacy[bot]]

Code Climate has analyzed commit 370ea7f6 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 95.3% (0.0% change).

View more on Code Climate.