Log Message:
py-cyclonedx-python-lib: update to 3.1.0.

v3.1.0

Feature

    Out-factor SPDX compound detection (fd4d537, 2b69925)
    License factories (033bad2)

Note: There was no 3.0.0 release officially, but due to CI publishing
issues, an unexpected 3.0.0 release was publiched to PyPi and
subsequently yanked from PyPi. There are NO breaking changes between
2.7.1 and 3.1.0.