Use slimmer scrollbars (#3283)

(hopefully) fixes https://github.com/jesseduffield/lazygit/issues/1924

The previous scrollbars were too chunky and encroached too much on a
view's content.

The new ones are slim and right-aligned so they encroach into dead space
between views which is much better.

Before:

![image](https://github.com/jesseduffield/lazygit/assets/8456633/fe125804-0cb8-4f9b-be4c-5710fd73ac14)


After:

![image](https://github.com/jesseduffield/lazygit/assets/8456633/8ae18f96-e2fd-46ff-be9a-09e745da1177)

Admittedly, the original scrollbars look more like typical scrollbars
and do a better job at telling you where the start and end of the
scrollbar is. We experimented with having special characters for
scrollbar bounds in the slim version but it all looked pretty ugly, and
there's just not many ascii characters to choose from.

Based on gocui PR: https://github.com/jesseduffield/gocui/pull/45

The important changes are in 
vendor/github.com/jesseduffield/gocui/gui.go
vendor/github.com/jesseduffield/gocui/scrollbar.go

The other changes are just modules being updated.

- **PR Description**

- **Please check if the PR fulfills these requirements**

* [x] Cheatsheets are up-to-date (run `go generate ./...`)
* [x] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [x] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [x] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [x] Docs (specifically `docs/Config.md`) have been updated if
necessary
* [x] You've read through your own file changes for silly mistakes etc

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