Update validate-pyproject requirement from <0.16 to <0.19

[dependabot]

Updates the requirements on validate-pyproject to permit the latest version.

Release notes

Sourced from validate-pyproject's releases.

v0.18

What's Changed

• Allow overwrite when schemas refer to the same tool, #175.

Full Changelog: abravalheri/validate-pyproject@v0.17...v0.18

Changelog

Sourced from validate-pyproject's changelog.

========= Changelog

.. Development Version

Version 0.16

• Allow overwriting schemas referring to the same tool, #175.

Version 0.16

• Update version regex according to latest packaging version, #153
• Remove duplicate # ruff: noqa, #158
• Remove invalid top-of-the-file # type: ignore statement, #159
• Align tool.setuptools.dynamic.optional-dependencies with project.optional-dependencies, #170
• Bump min Python version to 3.8, #167

Version 0.16

• Fix setuptools readme field , #116
• Fix oneOf <> anyOf in setuptools schema, #117
• Add previously omitted type keywords for string values, #117
• Add schema validator check, #118
• Add SchemaStore conversion script, #119
• Allow tool(s) to be specified via URL (added CLI option: --tool), #121
• Support uint formats (as used by Ruff's schema), #128
• Allow schemas to be loaded from SchemaStore (added CLI option: --store), #133

Version 0.15

• Update setuptools schema definitions, #112
• Add __repr__ to plugin wrapper, by @​henryiii #114
• Fix standard $schema ending #, by @​henryiii #113

Version 0.14

• Ensure reporting show more detailed error messages for RedefiningStaticFieldAsDynamic, #104
• Add support for repo-review, by @​henryiii in #105

Version 0.13

• Make it clear when using input from stdin, #96
• Fix summary for allOf, #100
• setuptools plugin:
  • Improve validation of attr directives, #101

... (truncated)

Commits

• bea3688 Update CHANGELOG
• 8781a9f Allow overwrite when schemas refer to the same tool (#175)
• b1a973c Simplify lambda used in tests
• c7ac8ca Fix broken fixture
• 64c36c9 Improve reproducibility of sorting
• 82ec7fa Allow overwrite for the same tool
• 020a342 Test expectation of allowing tools to be overwritten
• ddafc5a [pre-commit.ci] pre-commit autoupdate (#173)
• a069613 [pre-commit.ci] pre-commit autoupdate
• a090416 Update CHANGELOG
• Additional commits viewable in compare view

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[dependabot]

Superseded by #41.