fix `_process_relationships` for Sync client #1105

Job	Run time
Detect which file has changed	5s
prepare-environment / prepare	2s
python-lint	6s
action-lint	0s
markdown-lint	5s
yaml-lint	0s
validate-generated-documentation	55s
integration-tests-latest-infrahub	7m 23s
documentation	54s
validate-documentation-style	10s
unit-tests (3.10)	1m 28s
unit-tests (3.9)	1m 7s
unit-tests (3.13)	4m 51s
unit-tests (3.12)	1m 38s
unit-tests (3.11)	1m 11s
	19m 55s

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