GitLab

Bumps [github.com/libp2p/go-libp2p-core](https://github.com/libp2p/go-libp2p-core) from 0.5.3 to 0.5.6.
- [Release notes](https://github.com/libp2p/go-libp2p-core/releases)
- [Commits](https://github.com/libp2p/go-libp2p-core/compare/v0.5.3...v0.5.6)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>