[CI] Fix MSRV failure due to async-lock (or bump MSRV to 1.84 to get MSRV-aware resolver)

[jlizen]

error: rustc 1.82.0 is not supported by the following package:
  async-lock@3.4.2 requires rustc 1.85
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.82.0

example: https://github.com/aws/aws-lambda-rust-runtime/actions/runs/20501347843/job/58977029559?pr=1067

Looks like we implicitly picked up a newer version that bumped MSRV: smol-rs/async-lock#103

I thought we were using the MSRV-aware resolver...

[jlizen]

Oh, MSRV-aware resolver is only in 1.84...

[jlizen]

Related: #986 (setting policy for rolling MSRV forward)

[jlizen]

Reaching out to other maintainers to discuss bumping to 1.84, even in absence of a clear MSRV policy, as 1.84 is ~11 months old at this point. That would address this class of issues in the future, once we did.

Will hold off on pinning this dependency in the interim.

[github-actions]

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