chore: release main

[github-actions[bot]]

:robot: I have created a release beep boop

ucan: 0.4.0

## [0.4.0](https://github.com/ucan-wg/rs-ucan/compare/ucan-v0.3.2...ucan-v0.4.0) (2023-06-27) ### ⚠ BREAKING CHANGES * Update capabilites in line with UCAN 0.9/0.10 specs ([#105](https://github.com/ucan-wg/rs-ucan/issues/105)) * Update `fct`/`ucv` layout for 0.10.0 spec ([#108](https://github.com/ucan-wg/rs-ucan/issues/108)) * Support generic hashers in `UcanBuilder` and `ProofChain`. ([#89](https://github.com/ucan-wg/rs-ucan/issues/89)) ### Features * Allow nullable expiry, per 0.9.0 spec. Fixes [#23](https://github.com/ucan-wg/rs-ucan/issues/23) ([#95](https://github.com/ucan-wg/rs-ucan/issues/95)) ([12d4756](https://github.com/ucan-wg/rs-ucan/commit/12d475606da940b64654f17807adf592551982d0)) * Support generic hashers in `UcanBuilder` and `ProofChain`. ([#89](https://github.com/ucan-wg/rs-ucan/issues/89)) ([e057f87](https://github.com/ucan-wg/rs-ucan/commit/e057f87c7b278d18e77b1d3d213656d18b1a2fee)) * Update `fct`/`ucv` layout for 0.10.0 spec ([#108](https://github.com/ucan-wg/rs-ucan/issues/108)) ([ae19741](https://github.com/ucan-wg/rs-ucan/commit/ae197415048da201f7d75bf08cdb010b4f657895)) * Update capabilites in line with UCAN 0.9/0.10 specs ([#105](https://github.com/ucan-wg/rs-ucan/issues/105)) ([0bdf98f](https://github.com/ucan-wg/rs-ucan/commit/0bdf98f9043e753026711fb19449ab0bc6d87fc7))

ucan-key-support: 0.1.7

### Dependencies * The following workspace dependencies were updated * dependencies * ucan bumped from 0.3.2 to 0.4.0

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[github-actions[bot]]

:robot: Release is at https://github.com/ucan-wg/rs-ucan/releases/tag/ucan-v0.4.0 :sunflower:

[github-actions[bot]]

:robot: Release is at https://github.com/ucan-wg/rs-ucan/releases/tag/ucan-key-support-v0.1.7 :sunflower: