chore: rename dco.yaml to dco.yml #977

Job	Run time
SonarCloud Scan	1m 56s
Validate PR title	2s
platform-integration	4m 36s
mavenverify	1m 41s
platform-xtest / resolve-versions	12s
platform-xtest / cross-client-test (main)	21m 48s
platform-xtest / cross-client-test (v0.4.26)	12m 28s
ci	1s
	42m 44s

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