ci: bump prettyplease from 0.2.17 to 0.2.20

[dependabot[bot]]

Bumps prettyplease from 0.2.17 to 0.2.20.

Release notes

Sourced from prettyplease's releases.

0.2.20

• Resolve unexpected_cfgs warning (#73)

0.2.19

• Improve line placement for field assignment with multiline value (#68)

0.2.18

• Support Rust 1.77's C-string literal syntax

Commits

• 179974c Release 0.2.20
• 1321404 Merge pull request #73 from dtolnay/checkcfg
• c240656 Resolve unexpected_cfgs warning
• 096eac9 Update rustc initialization to nightly-2024-04-17
• e0d74e6 Release 0.2.19
• 8e800f6 Merge pull request #72 from dtolnay/assign
• a6aa390 Fix line placement for field assignment with multiline value
• 659fde6 Release 0.2.18
• fadd0df Merge pull request #71 from dtolnay/cstr
• 1ad491d Support C-string literal syntax
• Additional commits viewable in compare view

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