[WIP] chore: fix build problems in actions

[mate-from-mattr]

Fixes clippy warnings and GitHub actions.

Description

Clippy warnings were causing the master branch to fail. All pull requests from Dependabot also fail. I used cargo clippy --fix and fixed other warnings manually. This will mean our GitHub actions work 100% now.

• [x] ~Tests for the changes have been added (for bug fixes / features)~
• [x] The commit message(s) follow conventional commits
• [x] Documentation has been added / updated (for bug fixes / features)
• [x] Changes follow the contributing document.

Motivation and Context

All our GitHub checks need to pass and this will fix them.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Which merge strategy will you use?

• [ ] Squash
• [x] Rebase (REVIEW COMMITS)