Allow poetry-core 1.6.0 (#15588)

changelog.d/15588.misc

@@ -0,0 +1 @@
+Update build system requirements to allow building with poetry-core==1.6.0.

pyproject.toml

@@ -368,7 +368,7 @@ furo = ">=2022.12.7,<2024.0.0"
 # 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,<=1.5.0", "setuptools_rust>=1.3,<=1.6.0"]
+requires = ["poetry-core>=1.1.0,<=1.6.0", "setuptools_rust>=1.3,<=1.6.0"]
 build-backend = "poetry.core.masonry.api"