feat(pojo): add UNSPECIFIED value to AggregationPhase enum #859

Job	Run time
Lint commits for semantic-release	9s
Dry-run release	17s
Check editorconfig	5s
cyclonedx-sbom	1m 36s
Build Examples	1m 45s
Build and Test Java	4m 43s
Security validation	5s
osv-scanner (core)	9s
osv-scanner (isthmus)	9s
osv-scanner (isthmus-cli)	13s
Build Isthmus Native Image (ubuntu-latest)	6m 10s
Build Isthmus Native Image (macOS-latest)	29m 5s
	44m 26s

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