ci: fix clippy

[aasseman]

2 fixes for the clippy checks:

• Fail on warnings
• --all-targets, which somehow unearthed a lot of warnings

Then I fixed all the warnings in several passes.

[github-actions[bot]]

🤖 Cargo Audit Report 🤖

(Empty means OK! 👍)

[github-actions[bot]]

Pull Request Test Coverage Report for Build 5607428913

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.689%

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Totals
Change from base Build 5607411605:	0.0%
Covered Lines:	1027
Relevant Lines:	1242

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💛 - Coveralls

[aasseman]

Rebased onto latest main

[github-actions[bot]]

🤖 Cargo Audit Report 🤖

(Empty means OK! 👍)