Builds should state build Qt version as well as target platform

**What is the current behaviour and why should it be changed?**

Currently, the build chain states the target platform for each artifact built:
For example, https://github.com/jamulussoftware/jamulus/pull/3262:

However, specifically in that example, knowing the build Qt version would add significant information (above the redundant word "Build").

**Describe possible approaches**

Update the text to include the Qt version.

Start with the build chain and the artifact text shown in pull request #3262. Identify where the target platform label is assembled, then include the build Qt version in that text. Done means each artifact label reports both its Qt version and target platform.

Written by the indexing model from the issue text.