refactor(serverless,runtime-utils): avoid allocating `String`s

[QuiiBz]

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Avoid allocating String where possible and use &str instead

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🦋 Changeset detected

Latest commit: 7525ec37af6edc973c9479bfdeea428537a48b76

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

This PR includes changesets to release 2 packages

| Name | Type | | -------------------- | ----- | | @lagon/runtime-utils | Patch | | @lagon/serverless | Patch |

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