Update taffy requirement from 0.7 to 0.8

[dependabot]

Updates the requirements on taffy to permit the latest version.

Release notes

Sourced from taffy's releases.

v0.8.3

Fixed

• Fix serde feature on 32bit targets (#845)

Changelog

Sourced from taffy's changelog.

0.8.3

Fixed

• Fix serde feature on 32bit targets (#845)

0.8.2

Fixed

• Fix: Calculate correct new grid size when expanding cell_occupancy_matrix in the negative direction (#843)

0.8.1

Added

• Impl GridItemStyle and BlockContainerStyle for Style (#832).

0.8.0

Highlights

The big feature in this release is support for calc() values in the low-level API.

To use this API:

• Implement the resolve_calc_value method when implementing the LayoutPartialTree trait.
• Pass a type-erased pointer (*const ()) to constructors like LengthPercentage::calc(...)

Taffy treats the pointer as an opaque value (excepting that it uses the low 3 bits as a tag) which it will pass to LayoutPartialTree::resolve_calc_value along with a percentage resolution basis when it needs to resolve the value.

Changed

• The representation of many "size" types is now a tagged pointer than an enum. This is to enable calc(). The effected types are LengthPercentage, LengthPercentageAuto, Dimension, MinTrackSizingFunction, and MaxTrackSizingFunction types.

Added

• Special-case "compressible replaced elements" in grid sizing algorithm (#807) This allows for more correct sizing of "replaced" elements such as images that are children of flexbox or grid containers.

Fixed

• Grid: Fix infinite loop due to float precision in grid layout maximise tracks step (#792)
• Grid: Fix removed wrong addition, causing items to be misplaced. (#817)
• Grid: Fix grid placement for items with fixed primary axis (#818)

... (truncated)

Commits

• a31a40b Prepare for v0.8.3 release (#846)
• 5f6a8b1 Fix serde feature on 32bit targets (#845)
• 33adacc Bump DavidAnson/markdownlint-cli2-action from 19 to 20 (#839)
• 6b5e5ff Update grid requirement from 0.16.0 to 0.17.0 (#842)
• 9bace2c Prepare for v0.8.2 release (#844)
• 5db1a9d Fix: Calculate correct new grid size when expanding cell_occupancy_matrix in ...
• f391b9f Fix clippy lints (May 2025) (#841)
• 3d585ec Prepare for v0.8.1 release (#833)
• 01563c7 Impl GridItemStyle and BlockContainerStyle for Style (#832)
• c3ecb7d Prepare for 0.8.0 release (#808)
• Additional commits viewable in compare view

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[james7132]

Closing in favor of #20275.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.