fix(deps): update dependency sabre/xml to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sabre/xml (source)	require	major	^1.4.0 -> ^2.0.0

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Release Notes

sabre-io/xml

v2.2.3

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• #​191: add changelog and version bump that was missed in 2.2.2

v2.2.2

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• #​190: adjust libxml_disable_entity_loader calls ready for PHP 8.0 (@​phil-davis)

v2.2.1

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• #​183: fixed warning 'xml cannot be empty while reading', which might lead to a infinite-loop (@​mrow4a)
• #​179, #​178, #​177 #​176: several build/continous integration related improvements (@​phil-davis)

v2.2.0

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• #​171: Added Support for PHP 7.4, dropped Support for PHP 7.0 (@​staabm, @​phil-davis)
• #​174: Update testsuite to phpunit8 (@​phil-davis)
• Added phpstan coverage (@​phil-davis)
• #​144: Added a new functionCaller deserializer function for executing a callable when reading a XML
  element (@​vsouz4)

v2.1.3

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• #​166: Throw exception when empty inputs found

v2.1.2

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• #​161: Prevent infinite loop on empty xml elements

v2.1.1

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• #​149: Properly detect xml parse errors in parseCurrentElement() edge-cases

v2.1.0

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• #​112: Added a mixedContent deserializer function, which might be useful
  if you're parsing HTML-like documents with elements that contain both text
  and other elements as siblings. (@​staabm).

v2.0.2

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• #​161: Prevent infinite loop on empty xml elements

v2.0.1

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• #​149: Properly detect xml parse errors in parseCurrentElement() edge-cases

v2.0.0

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• Now requires PHP 7.
• Uses typehints everywhere.
• Fixed some minor strict typing-related issues.
• Removed workaround for PHP bug 64230.

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