chore(deps): update rust crate png to 0.18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
png	dev-dependencies	minor	0.17 -> 0.18

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Release Notes

image-rs/image-png (png)

v0.18.0

API Breaking Changes

• Removed deprecated Info::encode and Encoder::set_srgb methods.
• Improved the compression settings API for encoding.
• Decoder now requires a reader that implements Seek and BufRead traits.
• Bump bitflags dependency to 2.0.
• StreamingDecoder::update now takes a structured UnfilterBuf argument
  instead of a direct reference to a vector. This allows in-place
  decompression. There is a public constructor for UnfilterBuf.
• The methods Decoder::output_buffer_size and output_line_size now return
  Option<usize> to reflect that these calculations no longer overflow on some
  targets where the required buffers can not be represented in the address
  space. They return the mathematically correct size where possible.
• The Decoded enum returned from StreamingDecoder::update was simplified to
  no longer contains any chunk payload data. Instead, it now contains only
  chunk events where every chunk that was started will eventually be ended by
  ChunkComplete, BadAncillaryChunk or SkippedAncillaryChunk.
• Ancillary chunks, i.e. those not critical to decoder interpretation of the
  file, which fail to parse are now terminated with a BadAncillaryChunk event
  but no longer returned a DecodingError. This includes text chunks as well
  as many metadata chunks (except for fcTL that we deem crucial to the
  parser's understanding of the image sequence in an APNG despite being
  technically ancillary).

Additions

• Added Reader::read_row method.
• Add support for parsing eXIf chunk.
• Treat most auxiliary chunk errors as benign.
• Added splat_interlaced_row, which implements an alternative method for
  merging Adam7 interlaced lines into the output buffer that is more suitable
  for the presentation of progressive states of the buffer.
• Added Adam7Variant documenting the various methods for applying interlaced
  rows and to prepare an API to progressively read frames through Decoder.

Changes

• The decoding of Adam7 interlaced data is now much faster.
• The acTL chunk is now ignored when it is invalid, instead of producing
  errors while reading or decoding the following APNG chunks.
• The requirement of the fcTL chunk for the default image to match the IHDR's
  indicate image size is now enforced.
• More minor format errors in auxiliary chunks are now ignored by the decoder,
  instead disregarding the malformed chunk.
• Adam7 Interlacing on 32-bit targets now handles some cases correctly that
  previously wrote some bytes to the wrong pixel indices due to overflows.

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