Update dependency @tryghost/admin-api to v1.3.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@tryghost/admin-api	dependencies	patch	1.3.3 -> 1.3.4

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Release Notes

TryGhost/Ghost-SDK

### [`v1.3.4`](https://togithub.com/TryGhost/Ghost-SDK/compare/@tryghost/content-api@1.3.3...@tryghost/content-api@1.3.4) [Compare Source](https://togithub.com/TryGhost/Ghost-SDK/compare/@tryghost/admin-api@1.3.3...@tryghost/admin-api@1.3.4)

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