zvariant-2.1.0

Changes since 2.0.1:

• Add to_owned method to string types. This is different than already
  blanked implemented ToOwned trait, as it creates a clone with 'static
  lifetime.
• Deprecate Basic::ALIGNMENT for new alignment() function.
• Implement some conversions:
  • From<&String> for Str
  • From<&String> for Value
  • From<&Vec> for Value
• Fix infinite recursion in Error's PartialEq implementation.

zvariant-2.0.1

Merge branch 'de-bound-checks' into 'master'

zv: Ensure padding bytes exist before indexing into them

Closes #59

See merge request zeenix/zbus!140