Update symfony/yaml requirement from ^5.2 to ^6.1

[dependabot[bot]]

Updates the requirements on symfony/yaml to permit the latest version.

Release notes

Sourced from symfony/yaml's releases.

v6.1.0

Changelog (https://github.com/symfony/yaml/compare/v6.1.0-RC1...v6.1.0)

• no significant changes

Changelog

Sourced from symfony/yaml's changelog.

CHANGELOG

6.1

• In cases where it will likely improve readability, strings containing single quotes will be double-quoted

5.4

• Add new lint:yaml dirname --exclude=/dirname/foo.yaml --exclude=/dirname/bar.yaml option to exclude one or more specific files from multiple file list
• Allow negatable for the parse tags option with --no-parse-tags

5.3

• Added github format support & autodetection to render errors as annotations when running the YAML linter command in a Github Action environment.

5.1.0

• Added support for parsing numbers prefixed with 0o as octal numbers.

• Deprecated support for parsing numbers starting with 0 as octal numbers. They will be parsed as strings as of Symfony 6.0. Prefix numbers with 0o so that they are parsed as octal numbers.

  Before:

  Yaml::parse('072');
  

  After:

  Yaml::parse('0o72');
  

• Added yaml-lint binary.

• Deprecated using the !php/object and !php/const tags without a value.

5.0.0

• Removed support for mappings inside multi-line strings.
• removed support for implicit STDIN usage in the lint:yaml command, use lint:yaml - (append a dash) instead to make it explicit.

4.4.0

... (truncated)

Commits

• 84ce4f9 Clean skippable tests that are never skipped
• 85d7045 Minor cleanup
• d30f4b1 Leverage non-capturing catches
• a07ffe7 Bump minimum version of PHP to 8.1
• 8bdf056 Leverage the match expression
• 6e66c5b Merge branch '6.0' into 6.1
• e77f3ea Merge branch '5.4' into 6.0
• e80f87d minor #45085 [Yaml] Improve the deprecation warnings for octal numbers to sug...
• ee79e7e [Yaml] Improve the deprecation warnings for octal numbers to suggest migrating
• 3ed802c Merge branch '5.3' into 5.4
• Additional commits viewable in compare view

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