Release v1.4.0

Prepare cdoc2-java-ref-impl version 1.4.0 (#8)

* Prepare cdoc2-java-ref-impl release v1.4.0

[1.3.0] '/key-capsules' OAS v2.1.0 support (2024-07-02) +backport GH release

Backport GitHub release workflow for tag 'v1.3.0'

Features v1.3.0

• Support for '/key-capsules' OAS v2.1.0 in cdoc2-client and cdoc2-cli (added -exp option)
• cli: Improvements to interactive password asking (Don't ask password twice for decrypt).
  Label is not required, when CDOC2 file contains single password recipient.
• Add example project to demonstrate usage of cdoc2-java-ref-impl with cdoc4j (convert cdoc -> cdoc2)