feat(serverless,runtime,cli,wpt-runner): upgrade to Rust 1.70

[QuiiBz]

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• Upgrade to Rust 1.70
• Replace once_cell with std's OnceLock
• Set region label for prometheus exporter globally, instead of cloning a lot

⚠️ Waiting for cargo-chef to release 1.70: https://hub.docker.com/r/lukemathwalker/cargo-chef/tags

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🦋 Changeset detected

Latest commit: bfdb9e8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@lagon/cli	Patch
@lagon/runtime	Patch
@lagon/serverless	Patch
@lagon/wpt-runner	Patch
@lagon/js-runtime	Patch

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