Update symfony packages to v5 (major)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
symfony/property-access (source)	require	major	^4.0.0 -> ^5.0.0
symfony/serializer (source)	require	major	^4.0.0 -> ^5.0.0
symfony/yaml (source)	require	major	^4.0.0 -> ^5.0.0

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Release Notes

symfony/property-access

v5.0.0

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symfony/serializer

v5.0.0

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• throw an exception when creating a Serializer with normalizers which neither implement NormalizerInterface nor DenormalizerInterface
• throw an exception when creating a Serializer with encoders which neither implement EncoderInterface nor DecoderInterface
• changed the default value of the CsvEncoder "as_collection" option to true
• removed AbstractNormalizer::$circularReferenceLimit, AbstractNormalizer::$circularReferenceHandler,
  AbstractNormalizer::$callbacks, AbstractNormalizer::$ignoredAttributes,
  AbstractNormalizer::$camelizedAttributes, AbstractNormalizer::setCircularReferenceLimit(),
  AbstractNormalizer::setCircularReferenceHandler(), AbstractNormalizer::setCallbacks() and
  AbstractNormalizer::setIgnoredAttributes(), use the default context instead.
• removed AbstractObjectNormalizer::$maxDepthHandler and AbstractObjectNormalizer::setMaxDepthHandler(),
  use the default context instead.
• removed XmlEncoder::setRootNodeName() & XmlEncoder::getRootNodeName(), use the default context instead.
• removed individual encoders/normalizers options as constructor arguments.
• removed support for instantiating a DataUriNormalizer with a default MIME type guesser when the symfony/mime component isn't installed.
• removed the XmlEncoder::TYPE_CASE_ATTRIBUTES constant. Use XmlEncoder::TYPE_CAST_ATTRIBUTES instead.

symfony/yaml

v5.0.0

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• 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.

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