Auto merge of #26578 - servo:dependabot/cargo/synstructure-0.12.3, r=jdm

Bump synstructure from 0.12.1 to 0.12.3

Bumps [synstructure](https://github.com/mystor/synstructure) from 0.12.1 to 0.12.3.
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[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=synstructure&package-manager=cargo&previous-version=0.12.1&new-version=0.12.3)](https://dependabot.com/compatibility-score/?dependency-name=synstructure&package-manager=cargo&previous-version=0.12.1&new-version=0.12.3)

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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