Fix configuration of poetry-dynamic-versioning
The latest version of poetry-dynamic-versioning requires the PEP517 project configuration to be as follows:
[build-system]
requires = ["poetry-core>=1.0.0", "poetry-dynamic-versioning"]
build-backend = "poetry_dynamic_versioning.backend"
This patch results in correctly inferred version numbers from git, and fixes the SCCB CI job.