[rust/elixir] Align rustler version to 0.38.0 in mix.exs and mix.lock

[beryllw]

Purpose

Linked issue: close #3586

Brief change log

Tests

API and Format

Documentation

[Copilot]

Pull request overview

This PR updates the Elixir binding’s Rustler dependency to consistently use Rustler 0.38.x, aligning mix.exs and mix.lock with the existing rustler = "0.38" used by the native Rust crate under native/fluss_nif.

Changes:

• Bump {:rustler, "~> 0.37"} to {:rustler, "~> 0.38"} in mix.exs.
• Update mix.lock to pin rustler to 0.38.0 with corresponding checksums.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
fluss-rust/bindings/elixir/mix.exs	Updates the Rustler dependency constraint to ~> 0.38 for the Elixir project.
fluss-rust/bindings/elixir/mix.lock	Updates the locked Rustler hex package version to 0.38.0 to match the new constraint.

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