feat(pyproject): update to cyclonedx-python-lib 11.6

[gernot-h]

This seems to bring no breaking changes (despite some internal import restructuring which invalidates some of our imports) and is a first step to support CycloneDX 1.7 in a future version.

[tngraf]

Yes, this is the latest version of cyclonedx-python-lib.
But our output format is still CycloneDX 1.6, see capycli_bom_support.py, write_to_json().
Changing this to 1.7 may result ina conflict with Siemens Standard BOM linters.

[gernot-h]

But our output format is still CycloneDX 1.6, see capycli_bom_support.py, write_to_json().
Changing this to 1.7 may result ina conflict with Siemens Standard BOM linters.

Yes, I know. My idea was to keep CDX 1.6 as default output format, but to offer an option to create 1.7 SBOMs in certain commands, especially in "project createbom" (where I need properties for external references to record metadata like SW360 attachment ID in the SBOM for later download of it).