Update Rust crate quick-xml to 0.31.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
quick-xml	dependencies	minor	0.30.0 -> 0.31.0

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Release Notes

tafia/quick-xml (quick-xml)

v0.31.0

Compare Source

MSRV bumped to 1.56! Crate now uses Rust 2021 edition.

Enum representation was changed (it was buggy anyway) to ensure compatibility with
serde >= 1.0.181

New Features

• #​545: Resolve well-known namespaces (xml and xmlns) to their appropriate URIs.
  Also, enforce namespace constraints related to these well-known namespaces.
• #​635: Add support for async ElementWriter operations.

Bug Fixes

• #​660: Fixed incorrect deserialization of xs:lists from empty tags (<tag/>
  or <tag></tag>). Previously an DeError::UnexpectedEof") was returned in that case
• #​580: Fixed incorrect deserialization of vectors of newtypes from sequences of tags.
• #​661: More string handling of serialized primitive values (booleans, numbers, strings,
  unit structs, unit variants). <int>123<something-else/></int> is no longer valid
  content. Previously all data after 123 up to closing tag would be silently skipped.
• #​567: Fixed incorrect deserialization of vectors of enums from sequences of tags.
• #​671: Fixed deserialization of empty simpleTypes (for example, attributes) into
  Option fields: now they are always deserialized as Some("").

Misc Changes

• #​643: Bumped MSRV to 1.56. In practice the previous MSRV was incorrect in many cases.
• #​643: Adopted Rust 2021 edition.
• #​545: Added new Error variant -- Error::InvalidPrefixBind.
• #​651: Relax requirement for version of arbitrary dependency -- we're actually
  compatible with version 1.0.0 and up.
• #​649: Make features linkable and reference them in the docs.
• #​619: Allow to raise application errors in ElementWriter::write_inner_content
  (and newly added ElementWriter::write_inner_content_async of course).
• #​662: Get rid of some allocations during serde deserialization.
• #​665: Improve serialization of xs:lists when some elements serialized to an empty string.
• #​630: Fixed compatibility with serde >= 1.0.181

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