chore: update rust toolchain (v1.88.0) and kube-rs (v0.91.0)

[gauravgahlot]

What this PR does / why we need it:

The PR updates:

• the Rust toolchain from v1.82.0 to v1.88.0.
• the kube-runtime from v0.87.1 to v0.91.0.

Special notes for your reviewer:

I had to add to an exception in Rust check (clippy) GitHub workflow for:

• clippy::doc_overindented_list_items - reported in generated files
• result_large_err - touches multiple files, so I would prefer to tackle it separately

It's important to note that PR simply updates the dependency versions and does not really leverage the reconciliation provided like Kate was doing in her PR #702.

We definitely want to do that but I'm not there yet. So, I have added #778 and #779 to our roadmap.

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If applicable:

• this PR has an associated PR with documentation in akri-docs
• this PR contains unit tests
• added code adheres to standard Rust formatting (cargo fmt)
• code builds properly (cargo build)
• code is free of common mistakes (cargo clippy)
• all Akri tests succeed (cargo test)
• inline documentation builds (cargo doc)
• all commits pass the DCO bot check by being signed off -- see the failing DCO check for instructions on how to retroactively sign commits