Bump symfony/yaml from 4.4.17 to 4.4.20

[dependabot-preview[bot]]

Bumps symfony/yaml from 4.4.17 to 4.4.20.

Release notes

Sourced from symfony/yaml's releases.

v4.4.20

Changelog (https://github.com/symfony/yaml/compare/v4.4.19...v4.4.20)

• no changes

v4.4.19

Changelog (https://github.com/symfony/yaml/compare/v4.4.18...v4.4.19)

• bug #39787 a colon followed by spaces exclusively separates mapping keys and values (xabbuh)
• bug #39683 keep trailing newlines when dumping multi-line strings (xabbuh)
• bug #39668 do not dump extra trailing newlines for multiline blocks (xabbuh)

v4.4.18

Changelog (https://github.com/symfony/yaml/compare/v4.4.17...v4.4.18)

• bug #39274 fix lexing mapping values with trailing whitespaces (xabbuh)
• bug #39267 fix lexing backslashes in single quoted strings (xabbuh)
• bug #39241 fix lexing inline sequences/mappings with trailing whitespaces (Nyholm, xabbuh)

Commits

• 29e6130 Switched to non-null defaults in exception constructors
• 0a04eb0 [yaml] Delelte unused comparison operation
• 17ed9f1 Use createMock() and use import instead of FQCN
• a170990 Changed private static array-properties to const
• dd3f776 a colon followed by spaces exclusively separates mapping keys and values
• 22640fb Use ::class keyword when possible
• f1c4a3c minor #39775 [WIP] Use ::class keyword when possible (fabpot)
• 471d834 Use ::class keyword when possible
• 9bbbc93 minor #39773 Improve composer.json descriptions (fabpot)
• 498ad4e Improve composer.json descriptions
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #922.