Cyclonedx-py

Feature
* Bump to latest `cyclonedx-python-lib` ([`5902fbf`](https://github.com/CycloneDX/cyclonedx-python/commit/5902fbf9dc5becdf7d92180242488e56b998d9de))

Breaking
* Default Schema Version has been replaced by notion of LATEST supported Schema Version ([`5902fbf`](https://github.com/CycloneDX/cyclonedx-python/commit/5902fbf9dc5becdf7d92180242488e56b998d9de))

Fix
* Docker image release checkout ref w/o `tags` ([309](https://github.com/CycloneDX/cyclonedx-python/issues/309)) ([`5d8b1e1`](https://github.com/CycloneDX/cyclonedx-python/commit/5d8b1e159c2ced59e810b9e9564e19a29fe263d0))

Fix
* Properly support reading from stdin ([307](https://github.com/CycloneDX/cyclonedx-python/issues/307)) ([`23f31a0`](https://github.com/CycloneDX/cyclonedx-python/commit/23f31a03a4fbf888f396b88a9413c054358b2a3a))

Fix
* Bump dependencies to get latest `cyclonedx-python-lib` ([`87c3fe7`](https://github.com/CycloneDX/cyclonedx-python/commit/87c3fe7747cd8abd55ad5699bfc87ad9877c8132))

Feature
* Add support for CycloneDX 1.4 specification ([294](https://github.com/CycloneDX/cyclonedx-python/issues/294)) ([`7bb6d32`](https://github.com/CycloneDX/cyclonedx-python/commit/7bb6d328adec59cdd4c3ab80eb5f39568ca3bc9c))

Documentation
* Readme maintenance - shields & links ([266](https://github.com/CycloneDX/cyclonedx-python/issues/266)) ([`a34046f`](https://github.com/CycloneDX/cyclonedx-python/commit/a34046f9b4c96d013fdf2dbdac5e930aa9204e15))

Fix
* Revert to previous process for building Docker image as PyPi index update is too slow to pull straight away after publish ([`67bb738`](https://github.com/CycloneDX/cyclonedx-python/commit/67bb738246bfe0ca3acd409d8c5a27fd7a305347))