chore(deps): update dependency strukturag/libheif to v1.18.0

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This PR contains the following updates:

Package	Update	Change
strukturag/libheif	minor	1.17.6 -> 1.18.0

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Release Notes

strukturag/libheif (strukturag/libheif)

v1.18.0: - iOS18 images fixed, experimental VVC compression, compressed ISO23001-17 images

Compare Source

• now reads images generated by iOS 18
• heif-convert has been renamed to heif-dec
• encoding: property item boxes with identical content are reused
• experimental codec plugins for VVC (vvenc/vvdec and uvg266)
• experimental codec plugin for OpenJPH (High-throughput JPEG2000)
• support ISO 23001-17 version 1 uncC minimized headers
• support ISO 23001-17 images with 'deflate', 'zlib' and Brotli compression
• heif-enc can read TIFF images
• API functions to read/write raw items and item properties
• many bug fixes and smaller enhancements

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