⬆️ Update Rust crate png to v0.18.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
png	dependencies	patch	0.18.0 → 0.18.1

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Release Notes

image-rs/image-png (png)

v0.18.1

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)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 113 untouched benchmarks

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_{Comparing renovate/png-0.x-lockfile (6cfd7f8) with dev (6afe48a)}

[renovate]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.78%. Comparing base (6afe48a) to head (6cfd7f8).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1436   +/-   ##
=======================================
  Coverage   94.78%   94.78%           
=======================================
  Files         152      152           
  Lines        5969     5969           
  Branches      350      350           
=======================================
  Hits         5658     5658           
  Misses        249      249           
  Partials       62       62           

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