fix(chain): forward confirmation_height_upper_bound in Anchor implementation for &A

[evanlinjin]

Description

The blanket Anchor impl for &A was missing the confirmation_height_upper_bound method, causing it to fall back to the default implementation instead of delegating to the inner type.

Changelog notice

Fixed:

- The `Anchor::confirmation_height_upper_bound` impl was missing for `&A`, causing it to fallback to the default impl.

Checklists

All Submissions:

• I followed the contribution guidelines

Bugfixes:

* [ ] This pull request breaks the existing API
* [ ] I've added tests to reproduce the issue which are now passing
* [ ] I'm linking the issue being fixed by this PR

[Dmenec]

approach ACK

replacing &self with self should fix the Clippy lint that is breaking CI

fn confirmation_height_upper_bound(&self) -> u32 {
    <A as Anchor>::confirmation_height_upper_bound(self)
}

[Serious-Sam-Dev]

approach ACK, how the comment above says

approach ACK

replacing &self with self should fix the Clippy lint that is breaking CI

fn confirmation_height_upper_bound(&self) -> u32 {
    <A as Anchor>::confirmation_height_upper_bound(self)
}

only change need is to fix the clippy, all another test is ok