Bump github.com/libp2p/go-libp2p-core from 0.5.3 to 0.5.6

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>

go.mod

@@ -4,7 +4,7 @@ require (
 	github.com/gogo/protobuf v1.3.1
 	github.com/ipfs/go-log v1.0.4
 	github.com/libp2p/go-libp2p-blankhost v0.1.4
-	github.com/libp2p/go-libp2p-core v0.5.5
+	github.com/libp2p/go-libp2p-core v0.5.6
 	github.com/libp2p/go-libp2p-discovery v0.4.0
 	github.com/libp2p/go-libp2p-swarm v0.2.4
 	github.com/multiformats/go-multiaddr v0.2.2

go.sum

@@ -153,6 +153,8 @@ github.com/libp2p/go-libp2p-core v0.5.3/go.mod h1:uN7L2D4EvPCvzSH5SrhR72UWbnSGpt
 github.com/libp2p/go-libp2p-core v0.5.4/go.mod h1:uN7L2D4EvPCvzSH5SrhR72UWbnSGpt5/a35Sm4upn4Y=
 github.com/libp2p/go-libp2p-core v0.5.5 h1:/yiFUZDoBWqvpWeHHJ1iA8SOs5obT1/+UdNfckwD57M=
 github.com/libp2p/go-libp2p-core v0.5.5/go.mod h1:vj3awlOr9+GMZJFH9s4mpt9RHHgGqeHCopzbYKZdRjM=
+github.com/libp2p/go-libp2p-core v0.5.6 h1:IxFH4PmtLlLdPf4fF/i129SnK/C+/v8WEX644MxhC48=
+github.com/libp2p/go-libp2p-core v0.5.6/go.mod h1:txwbVEhHEXikXn9gfC7/UDDw7rkxuX0bJvM49Ykaswo=
 github.com/libp2p/go-libp2p-discovery v0.4.0 h1:dK78UhopBk48mlHtRCzbdLm3q/81g77FahEBTjcqQT8=
 github.com/libp2p/go-libp2p-discovery v0.4.0/go.mod h1:bZ0aJSrFc/eX2llP0ryhb1kpgkPyTo23SJ5b7UQCMh4=
 github.com/libp2p/go-libp2p-loggables v0.1.0 h1:h3w8QFfCt2UJl/0/NW4K829HX/0S4KD31PQ7m8UXXO8=