deps(python): update xmlschema requirement from >=3.3.2 to >=4.3.1

[dependabot]

Updates the requirements on xmlschema to permit the latest version.

Release notes

Sourced from xmlschema's releases.

v4.3.1 (2026-01-17)

• normalize_url(): workaround for issue #467 (UNC paths with Python < 3.12.5)
• META_SCHEMA and BASE_SCHEMA paths converted to 'file' URL scheme
• Clean optional dependencies

Changelog

Sourced from xmlschema's changelog.

v4.3.1_ (2026-01-17)

• normalize_url(): workaround for issue #467 (UNC paths with Python < 3.12.5)
• META_SCHEMA and BASE_SCHEMA paths converted to 'file' URL scheme
• Clean optional dependencies

v4.3.0_ (2026-01-03)

• Add arguments validation for schemas and validation methods (by validation contexts)
• Add custom XPath parser for find/findall/iterfind APIs on schemas for match singleton sequence also if position is a number greater than 1 in predicate expression (issue #468)
• Improve build of XSD elements and groups, using a three-state built flag for components
• Extend and fix memory tests (Python 3.14+ seems to consume more memory)
• Drop support for Python 3.9 and add development support for Python 3.15

v4.2.0_ (2025-10-14)

• Add arguments validation for schemas and validation methods (by validation contexts)
• Add SchemaSettings dataclass for storing read-only settings for schema instances and for managing package default settings
• Add block argument to XMLResource class (issue #464)
• Add MAX_SCHEMA_SOURCES package limit (1000, applied to XsdGlobals global maps instances)
• Add MAX_XML_ELEMENTS package limit (1,000,000, applied to non-lazy XMLResource instances)
• Reduce MAX_XML_DEPTH limit to 1000 and apply it to all XMLResource instances
• Fix for substitute match in case of unexpected child (issue #461)

v4.1.0_ (2025-06-05)

• Add XPath selectors: ElementSelector and ElementPathSelectors
• Add selector argument to XMLResource and iterparse filters
• Fix element substitution (issue #452)
• Restore v3.4.5 builder methods as helpers (issue #451)
• Add overall_min_occurs and overall_max_occurs helpers to XsdElement (issue #449)
• Extend error message for XML syntax errors (issue #448)
• Fix query/fragment like for filenames (issue #447)

v4.0.1_ (2025-04-12)

• Fix XSD identity update with xsi:type substitution (issue #446)

v4.0.0_ (2025-04-11)

• Extend support of lxml.etree through iterparse optional argument
• Rework internal decoding/encoding methods, replacing generators with normal functions
• Replace kwargs with a validation context (DecodeContext and EncodeContext)
• Add SchemaLoader class and variants (related to #419)
• Slicing of XsdGlobals with parent maps
• Fix XsdUnion validation performance issue (related to #442)

... (truncated)

Commits

• 64b103f Add a test for meta-schema URLs and relax memory test for Python 3.14
• 508d1a2 Update bugfix release information and clean deps of pyproject.toml
• 4fc64bd Refactor LocationPath and add a workaround for issue #467
• dfec443 Don't serialize cached properties
• 91c1956 Add caching module with class SchemaCache
• 2bfb931 Update CI tests and release info
• a1d7d3c Change built status of components from bool to optional bool
• ce822bd Extend and fix memory tests
• fa41056 Add a custom XPath parser for schema find/findall/iterfind APIs
• b237528 Add a test with UNC path
• Additional commits viewable in compare view

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