Bump gocui and adapt lazygit code

Adaptions are for this gocui commit:

Cleanup: remove Is* error functions

- Use errors.Is instead of quality comparisons. This is better because it
  matches wrapped errors as well, which we will need later in this branch.
- Inline the errors.Is calls at the call sites. This is idiomatic go, we don't
  need helper functions for this.

See https://go.dev/blog/go1.13-errors for more about this.

pkg/gui/views.go

@@ -1,6 +1,7 @@
 package gui
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/jesseduffield/gocui"
@@ -78,7 +79,7 @@ func (gui *Gui) createAllViews() error {
 	var err error
 	for _, mapping := range gui.orderedViewNameMappings() {
 		*mapping.viewPtr, err = gui.prepareView(mapping.name)
-		if err != nil && !gocui.IsUnknownView(err) {
+		if err != nil && !errors.Is(err, gocui.ErrUnknownView) {
 			return err
 		}
 	}