Update symfony/yaml requirement from ^6.4 || ^7.4 to ^8.1.6

[dependabot]

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

Release notes

Sourced from symfony/yaml's releases.

v8.1.6

Changelog (symfony/yaml@v8.1.5...v8.1.6)

• bug #65727 Fix a TypeError when "!!binary" is given an unparsable value (@​nicolas-grekas)
• bug #65688 Bound recursion depth in the inline lexer (@​nicolas-grekas)
• bug #65651 Quote strings that look like octal numbers when dumping (@​lazerg)

Changelog

Sourced from symfony/yaml's changelog.

CHANGELOG

8.2

• Add support for the !!null, !!bool and !!int tags, and accept quoted values for them and for !!float
• Throw a ParseException when the value of a !!float tag is not a valid float, instead of casting it to 0.0
• Add a gitlab output format to the lint:yaml command, producing a report in the GitLab Code Quality format
• Add a Schema namespace with a SchemaValidatorInterface to validate data against a JSON Schema, a SchemaResolverInterface to determine the schema of a document, and their SchemaValidator and FileHeaderSchemaResolver implementations
• Add JSON Schema validation to the lint:yaml command through the --check-schema option or a # yaml-language-server: $schema= / # $schema= file header

8.0

• Remove support for parsing duplicate mapping keys whose value is null

7.3

• Add compact nested mapping support by using the Yaml::DUMP_COMPACT_NESTED_MAPPING flag
• Add the Yaml::DUMP_FORCE_DOUBLE_QUOTES_ON_VALUES flag to enforce double quotes around string values

7.2

• Deprecate parsing duplicate mapping keys whose value is null
• Add support for dumping null as an empty value by using the Yaml::DUMP_NULL_AS_EMPTY flag

7.1

• Add support for getting all the enum cases with !php/enum Foo

7.0

• Remove the !php/const: tag, use !php/const instead (without the colon)

6.3

• Add support to dump int keys as strings by using the Yaml::DUMP_NUMERIC_KEY_AS_STRING flag

6.2

• Add support for !php/enum and !php/enum *->value
• Deprecate the !php/const: tag in key which will be replaced by the !php/const tag (without the colon) since 3.4

... (truncated)

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[hugo-goncalves-kununu]

@dependabot ignore this major version

[dependabot]

OK, I won't notify you about version 8.x.x again, unless you re-open this PR.