Add custom_attributes field to OrganizationMembership #1292

Job	Run time
Test Python 3.13	23s
Test Python 3.12	28s
Test Python 3.10	24s
Test Python 3.8	13s
Test Python 3.11	25s
Test Python 3.14	44s
Test Python 3.9	22s
Smoke test (Python ${{ matrix.python }})	-6s
	2m 53s

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