fix(poetry): properly handle multi-declaration (optional) dependencies

[jkowalleck]

fixes #840

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 100.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3a50f8d)	1092	1055	96.61%
Head commit (704b208)	1095 (+3)	1058 (+3)	96.62% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#842)	7	7	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[jkowalleck]

this was released via https://github.com/CycloneDX/cyclonedx-python/releases/tag/v5.1.2