release v0.11.0

[marten-seemann]

This is first time we're using the new release workflows.
As soon as this PR is merged, CI will cut the new release.

Also note the message that @github-actions posted below.

[github-actions]

Suggested version: v0.11.0
Comparing to: v0.10.0 (diff)

Changes in go.mod file(s):

(empty)

gorelease says:

# github.com/libp2p/go-libp2p-core/network
## incompatible changes
ConnHandler: removed
Network.SetConnHandler: removed

# github.com/libp2p/go-libp2p-core/transport
## incompatible changes
Network.SetConnHandler, method set of TransportNetwork: removed

# summary
Suggested version: v0.11.0

gocompat says:

"github.com/libp2p/go-libp2p-core/network".ConnHandler TopLevelDeclarationDeleted
"github.com/libp2p/go-libp2p-core/network".Network InterfaceChanged
"github.com/libp2p/go-libp2p-core/transport".TransportNetwork InterfaceChanged