build(deps): update png requirement from 0.17 to 0.18 in /computer

[dependabot]

Updates the requirements on png to permit the latest version.

Changelog

Sourced from png's changelog.

0.18.1

Additions

• Added Filter::MinEntropy for encoding, which selects the filter that minimizes the Shannon entropy of the filtered row. (#647)
• Made ScaledFloat::SCALING constant public. (#650)
• Support skipping chunks without loading them into memory. (#630)
• Allow full unfiltering for partial data, enabling progressive decoding use cases. (#664)

Changes

• Improved Paeth unfilter auto-vectorization by changing how loop state is maintained. (#635)
• Added portable_simd Paeth unfiltering for 3bpp and 4bpp images on nightly. (#632, #633)
• Add early exit for adaptive filter selection when a perfect filter is found. (#646)
• Ignore duplicate acTL chunks instead of producing errors. (#651)
• Require IDAT chunk(s) before fdAT chunks, as mandated by PNG specification. (#653)
• Enforce acTL frame counts to be valid PNG 4-byte integers (capped at 2^31-1). (#673)

Fixes

• Fixed and improved intra-doc links in documentation comments. (#665)
• Fixed nightly portable_simd build. (#675)

#630: image-rs/image-png#630 #632: image-rs/image-png#632 #633: image-rs/image-png#633 #635: image-rs/image-png#635 #646: image-rs/image-png#646 #647: image-rs/image-png#647 #650: image-rs/image-png#650 #651: image-rs/image-png#651 #653: image-rs/image-png#653 #664: image-rs/image-png#664 #665: image-rs/image-png#665 #673: image-rs/image-png#673 #675: image-rs/image-png#675

0.18.0

API Breaking Changes

• Removed deprecated Info::encode and Encoder::set_srgb methods.
• Improved the compression settings API for encoding.

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