gopls/v0.6.11

This release contains mainly bug fixes. A full list of all issues fixed can be found in the gopls/v0.6.11 milestone. To report a new problem, please file a new issue at https://golang.org/issues/new.

Thank you to our contributors!

@ShoshinNikita @sakateka @muirdm Will Langford @empire @justplesh @suzmue