fix(ci): cut run-integration-test.yml over to "mlugg/setup-zig@v2", clippy fixes

[jlizen]

✍️ Description of changes:

Run-integ setup-zig action change

We had pinned back our cargo-lambda version due to CI failures. Ref: #989

The cargo-lambda issue was closed because it was determined that the issue had to do with the underlying zig install. essentially, you need libraries available, not just the binary. Ref: cargo-lambda/cargo-lambda#856 (comment)

In the process of cleaning up, I noticed we were using an archived action. Cutting us over to the modern one.

Unfortunately, this wasn't sufficient to fix the issue, sample run, so leaving us pinned for now. I cut a backlog: #1006

Clippy fixes

The new clippy turned inline variable enforcement in fmt strings from pedantic to warn, so our CI started failing. Fixing.

🔏 By submitting this pull request

• I confirm that I've ran cargo +nightly fmt.
• I confirm that I've ran cargo clippy --fix.
• I confirm that I've made a best effort attempt to update all relevant documentation.
• I confirm that my contribution is made under the terms of the Apache 2.0 license.

[bnusunny]

LGTM