build(deps): bump github.com/kovidgoyal/imaging from 1.7.2 to 1.8.8

[dependabot[bot]]

Bumps github.com/kovidgoyal/imaging from 1.7.2 to 1.8.8.

Release notes

Sourced from github.com/kovidgoyal/imaging's releases.

v1.8.8

No release notes provided.

v1.8.7

No release notes provided.

v1.8.6

No release notes provided.

v1.8.5

No release notes provided.

v1.8.4

No release notes provided.

v1.8.3

No release notes provided.

v1.8.2

No release notes provided.

Commits

• 3db2fa6 Bump version
• 399f52c Function to get RGB8 pixel data from images
• 2ee8c32 magick backend: dont resize unless actually needed
• 0418ef1 ...
• 9721b70 Document the convenience scripts
• 8d6d9e6 Bump version
• dd016ef Update the README
• 3e089a8 Use only the Go backend for the demo programs
• 82a84ce Add some docs
• 47201d5 Fix data race test failure
• Additional commits viewable in compare view

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