Roll forward to run on newer .NET Runtime major versions

[Aldaviva]

Types of changes

• Bugfix
• Enhancement (new and/or improved behavior)
• Refactoring (no functional changes)
• Code style update (no functional changes)
• Dependencies added, updated, or removed
• Build related changes
• Repository infrastructure changes (e.g. changes to issue / PR templates)
• CI related changes
• Documentation update
• Other (please describe below)

Proposed changes / fixed issues

Closes #75

Checklist

• My contribution is my original work
• My contribution, or part of it, comes from projects with an MIT-compatible license AND I have updated the THIRD-PARTY-NOTICES file accordingly
• I have added and/or updated related documentation (if applicable)
• I have updated the "Unreleased changes" section in CHANGELOG.md according to the modifications I made

Other information