chore(main): release 3.15.8

[github-actions[bot]]

:robot: I have created a release beep boop

3.15.8 (2023-10-21)

Bug Fixes

• Fixes dice parsing displaying incorrectly (c626dd9)
• Fixes image blocks not resolving if a property other than image is used (close #300) (d0a4b30)
• Saves blocks will now allow strings (close #267) (3bca930)

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[github-actions[bot]]

:robot: Release is at https://github.com/javalent/fantasy-statblocks/releases/tag/3.15.8 :sunflower: