Consider bumping msrv from 1.85

[Jefffrey]

Is your feature request related to a problem or challenge?

Currently on 1.85:

arrow-rs/Cargo.toml

Line 85 in c1f99af

rust-version = "1.85"

Some dependencies have higher versions now:

• chore(deps): bump atoi from 2.0.0 to 3.1.0 #10219 - needs 1.86
• chore(deps): bump the tonic group across 1 directory with 3 updates #10183 - needs 1.88
• chore(deps): bump sysinfo from 0.38.4 to 0.39.5 #10205 - needs 1.95

Describe the solution you'd like

Consider bumping our msrv, but keeping in line with our policy:

arrow-rs/README.md

Lines 114 to 118 in c1f99af

	### Rust Version Compatibility Policy
	arrow-rs and parquet are built and tested with stable Rust, and will keep a rolling MSRV (minimum supported Rust version) that can only be updated in major releases on an as needed basis (e.g. project dependencies bump their MSRV or a particular Rust feature is useful for us etc.). The new MSRV if selected will be at least 6 months old. The minor releases are guaranteed to have the same MSRV.
	Note: If a Rust hotfix is released for the current MSRV, the MSRV will be updated to the specific minor version that includes all applicable hotfixes preceding other policies.

• If we decide to bump, we'd need to ensure we don't select too new a version, and do this as part of a major version bump

Describe alternatives you've considered

No response

Additional context

1.88 gives us let chains 🙂