devel/py-azure-mgmt-core: Update to 1.6.0

• Update WWW
• Add LICENSE_FILE
• Convert to USE_PYTHON=pep517
• Update pkg-descr

Changes: https://github.com/Azure/azure-sdk-for-python/releases

		https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/core/azure-mgmt-core/CHANGELOG.md