fix: use consistent rlp encoding

[klkvr]

Changes KeyAuthorization and TokenLimit to use consistent rlp encoding which ensures that each value can only be represented with a single RLP payload

This would be breaking for tooking that was encoding expiry: None as 0x80 instead of omitting it

[github-actions]

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tempo-primitives: minor
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Bumped `alloy-rlp` to 0.3.15 and adopted `#[rlp(trailing(canonical))]` for `KeyAuthorization` and `TokenLimit` wire types, using `NonZeroU64` to ensure canonical RLP encoding of optional trailing fields. Replaced derive-based RLP impl on `KeyAuthorization` with manual encode/decode via a `KeyAuthorizationWire` intermediary.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	alloy-rlp@​0.3.13 ⏵ 0.3.15

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