Bump sharp from 0.26.2 to 0.27.0

Bumps sharp from 0.26.2 to 0.27.0.

Changelog

Sourced from sharp's changelog.

v0.27.0 - 22nd December 2020

• Add support for AVIF to prebuilt binaries.

• Remove experimental status from heif output, defaults are now AVIF-centric.

• Allow negative top/left offsets for composite operation. #2391 @CurosMJ

• Ensure all platforms use fontconfig for font rendering. #2399

v0.26 - zoom

Requires libvips v8.10.0

v0.26.3 - 16th November 2020

• Expose libvips' affine operation. #2336 @guillevc

• Fallback to tar.gz for prebuilt libvips when Brotli not available. #2412 @ascorbic

Commits

• b2a0b8c Release v0.27.0
• 4debc46 Docs: add AVIF to supported formats
• f4e259d Pre-release v0.27.0-beta1 (prebuild test)
• 774d782 Docs: update performance test results
• 0e62bde Update (and pin) benchmark module versions
• 2bbd9b2 Add new leak test suppressions (fontconfig, gsf, rsvg)
• 0267614 Allow for negative top/left offsets in composite overlays
• 182beaa Docs: add note about AVIF images smaller than 16x16
• 7c08a09 Add new leak test suppressions (rsvg, vips, heif, aom)
• ef964b5 Ensure all platforms use fontconfig to render #2399
• Additional commits viewable in compare view

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