Bump sharp from 0.23.0 to 0.23.4

[dependabot-preview]

Bumps sharp from 0.23.0 to 0.23.4.

Changelog

Sourced from sharp's changelog.

v0.23.4 - 5^th December 2019

• Handle zero-length Buffer objects when using Node.js v13.2.0+.

• Expose raw TIFFTAG_PHOTOSHOP metadata. #1600

• Improve thread safety by using copy-on-write when updating metadata. #1986

v0.23.3 - 17^th November 2019

• Ensure trim operation supports images contained in the alpha channel. #1597

• Ensure tile overlap option works as expected. #1921 @rustyguts

• Allow compilation on FreeBSD and variants (broken since v0.23.0) #1952 @pouya-eghbali

• Ensure modulate and other colour-based operations can co-exist. #1958

v0.23.2 - 28^th October 2019

• Add background option to tile output operation. #1924 @neave

• Add support for Node.js 13. #1932 @MayhemYDG

v0.23.1 - 26^th September 2019

• Ensure sharp.format.vips is present and correct (filesystem only). #1813

• Ensure invalid width and height provided as options to resize throw. #1817

• Allow use of 'heic' and 'heif' identifiers with toFormat. #1834 @jaubourg

• Add premultiplied option to composite operation. #1835

... (truncated)

Commits

• 596b38a Release v0.23.4
• d31a91a Expose raw TIFFTAG_PHOTOSHOP metadata #1600
• 400ef71 Handle zero-length Buffers in Node.js v13.2.0+
• bb15cd9 Improve thread safety with copy-on-write for metadata #1986
• 6ee6a22 Docs: add FreeBSD build status
• 94d51a9 Docs: recommend jemalloc buildpack for Heroku
• d0feb41 Release v0.23.3
• 0d1278d Improve C++ linting, move exceptions inline
• 1b401b1 Add FreeBSD to CI via Cirrus #1953
• 11daa3b Tests: flatten to mid-grey before generating fingerprint
• Additional commits viewable in compare view

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