Support CycloneDX 1.6.1

[jkowalleck]

fixes #551

• fetched latest schema from https://github.com/CycloneDX/specification/blob/1.6.1/schema/bom-1.6*
• fetched latest tests from https://github.com/CycloneDX/specification/tree/master/tools/src/test/resources/1.6

[jkowalleck]

some tests seam to fail.

I am not familiar with this setup and the Java implementation.
Could you help me out, @stevespringett, @nscuro,

[mr-zepol]

#551

I can help checking this

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.07%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f9b5bea)	6072	4456	73.39%
Head commit (fce34d4)	6072 (+0)	4460 (+4)	73.45% (+0.07%)

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 (#552)	0	0	∅ (not applicable)

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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[mr-zepol]

@jkowalleck Test issues fixed

[mr-zepol]

SInce I made some changes it does not make sense I approve, but they look good to me