Update version constraint to allow the latest `poetry-core` `1.9.1` (#17902)

Update version constraint to allow the latest `poetry-core` `1.9.1`

Context:

> 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.

Mergeable version of https://github.com/element-hq/synapse/pull/17848

changelog.d/17902.misc

+Update version constraint to allow the latest poetry-core 1.9.1.

pyproject.toml

@@ -370,7 +370,7 @@ tomli = ">=1.2.3"
 # runtime errors caused by build system changes.
 # We are happy to raise these upper bounds upon request,
 # provided we check that it's safe to do so (i.e. that CI passes).
-requires = ["poetry-core>=1.1.0,<=1.9.0", "setuptools_rust>=1.3,<=1.8.1"]
+requires = ["poetry-core>=1.1.0,<=1.9.1", "setuptools_rust>=1.3,<=1.8.1"]
 build-backend = "poetry.core.masonry.api"