[Security] Bump symfony/yaml from 2.1.0 to 2.8.52

Bumps symfony/yaml from 2.1.0 to 2.8.52. This update includes a security fix.

Vulnerabilities fixed

Sourced from The PHP Security Advisories Database.

Ability to enable/disable object support in YAML parsing and dumping

Affected versions: >=2.0.0, =2.1.0, <2.1.7

Changelog

Sourced from symfony/yaml's changelog.

CHANGELOG

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

Added support for parsing the inline notation spanning multiple lines.

Added support to dump null as ~ by using the Yaml::DUMP_NULL_AS_TILDE flag.

deprecated accepting STDIN implicitly when using the lint:yaml command, use lint:yaml - (append a dash) instead to make it explicit.

4.3.0

Using a mapping inside a multi-line string is deprecated and will throw a ParseException in 5.0.

4.2.0

... (truncated)

Commits

02c1859 Bump phpunit XSD version to 5.2
0e16589 CS fix
5baf0f8 Fix code examples in PHPDoc
fbf8766 Alpha-ordering for "use" statements
acaaa95 Enable the fixer enforcing fully-qualified calls for compiler-optimized funct...
51356b7 Merge branch '2.7' into 2.8
5bbd7e6 Use symfony/polyfill-ctype
d20bd2b Merge branch '2.7' into 2.8
e2c80e6 [Yaml] Throw parse error on unfinished inline map
be720fc Merge branch '2.7' into 2.8
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WyriHaximus / reactphp-child-process-pool

[Security] Bump symfony/yaml from 2.1.0 to 2.8.52 #61

CHANGELOG

5.3

5.1.0

5.0.0

4.4.0

4.3.0