Update version constraint to allow the latest poetry-core 1.9.1

[hrnciar]

Hello, I am working on updating poetry-core in Fedora and synapse is one of affected packages. Please run a CI to see if it works properly. Thank you.

Pull Request Checklist

• Pull request is based on the develop branch
• Pull request includes a changelog file. The entry should:
  • Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from EventStore to EventWorkerStore.".
  • Use markdown where necessary, mostly for code blocks.
  • End with either a period (.) or an exclamation mark (!).
  • Start with a capital letter.
  • Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry.
• Code style is correct
  (run the linters)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[hrnciar]

My manager couldn't confirm whether I am allowed to sign the CLA. I've contacted our legal team, but I haven't gotten any response yet. Consider this as a public domain and feel free to commit the change under your name.

[MadLittleMods]

Consider this as a public domain and feel free to commit the change under your name.

I've created #17902 to avoid merging some commits from someone who hasn't signed the CLA ⏩