Bump p2-maven-connector from 0.4.0 to 0.5.0

Bumps [p2-maven-connector](https://github.com/veithen/p2-maven-connector) from 0.4.0 to 0.5.0.
- [Release notes](https://github.com/veithen/p2-maven-connector/releases)
- [Commits](https://github.com/veithen/p2-maven-connector/compare/0.4.0...0.5.0)

Signed-off-by: dependabot[bot] <support@github.com>
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