v1.43 Setting a baseline with some bumps

We haven't been maintaining our release notes (sorry!), so I'm starting us off with this. These bumps should only affect the project (build etc.), not the released library, but I wanted to set a baseline for future releases.

What's Changed

• Bump whelk-io/maven-settings-xml-action from 10 to 21 by @dependabot in #95
• Bump maven-compiler-plugin from 3.9.0 to 3.11.0 by @dependabot in #119
• Update pr-validation workflow by @dependabot in #94
• Bump awaitility from 4.1.1 to 4.2.0 by @dependabot in #82
• Bump nexus-staging-maven-plugin from 1.6.8 to 1.6.13 by @dependabot in #86

Full Changelog: v1.42...v1.43