Update imagesize requirement from 0.12.0 to 0.13.0

[dependabot[bot]]

Updates the requirements on imagesize to permit the latest version.

Release notes

Sourced from imagesize's releases.

v0.13.0

What's Changed

• List Avif format in README.md by @​seanaye in Roughsketch/imagesize#33
• Add support for ILBM by @​KateMorley in Roughsketch/imagesize#36
• Distinguish between HEIF and HEIC by @​rsuu in Roughsketch/imagesize#34
• Mark ImageType as non-exhaustive by @​Roughsketch in Roughsketch/imagesize#40

New Contributors

• @​seanaye made their first contribution in Roughsketch/imagesize#33
• @​KateMorley made their first contribution in Roughsketch/imagesize#36

Also thanks to @​virtualritz for initially introducing some formatting changes and bumping the edition.

Full Changelog: https://github.com/Roughsketch/imagesize/compare/v0.12.0...v0.13.0

Commits

• 017b33d Update to 0.13
• c8273c3 Update Cargo.toml
• 4428f98 Merge pull request #40 from Roughsketch/feature/non-exhaustive
• c5f58ea Mark ImageType as non-exhaustive
• 2280315 Merge branch 'fix/formatting'
• eb46c00 Cargo fmt
• 0ebcabd Avoid else if on returns
• ef50b2f Rename variables, clean up flow
• 5cd7f65 Move comments into their respective blocks
• d1d23b7 Should not be prefixing m_
• Additional commits viewable in compare view

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