Auto merge of servo#29499 - servo:dependabot/cargo/exr-1.6.3, r=jdm

Bump exr from 1.5.3 to 1.6.3

Bumps [exr](https://github.com/johannesvollmer/exrs) from 1.5.3 to 1.6.3.
<details>
<summary>Commits</summary>
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<li>See full diff in <a href="https://github.com/johannesvollmer/exrs/commits">compare view</a></li>
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</details>
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[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=exr&package-manager=cargo&previous-version=1.5.3&new-version=1.6.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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[//]: # (dependabot-automerge-start)
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Author: bors-servo