Bump ajv from 8.11.2 to 8.12.0

Bumps ajv from 8.11.2 to 8.12.0.

Release notes

Sourced from ajv's releases.

v8.12.0

• fix JTD serialisation (remove leading comma in objects with only optional properties) (#2190, @​piliugin-anton)
• empty JTD "values" schema (#2191)
• empty object to work with JTD utility type (#2158, @​erikbrinkman)
• fix JTD "discriminator" schema for objects with more than 8 properties (#2194)
• correctly narrow "number" type to "integer" (#2192, @​JacobLey)
• update Node.js versions in CI to 14, 16, 18 and 19

Commits

• bf1266a 8.12.0
• 321fad6 update node versions (#2195)
• c5c195b fix JTD discriminator with more than 8 properties, fixes #1971 (#2194)
• 527d43a build(deps-dev): bump @​rollup/plugin-commonjs from 23.0.7 to 24.0.0 (#2184)
• 2e5884b build(deps-dev): bump @​rollup/plugin-typescript from 9.0.2 to 10.0.1 (#2193)
• a697668 build(deps-dev): bump @​rollup/plugin-json from 5.0.2 to 6.0.0 (#2183)
• dab8504 special case empty object for jtd (#2158)
• d2c57d9 build(deps-dev): bump @​rollup/plugin-typescript from 8.5.0 to 9.0.2 (#2160)
• a489265 correctly narrow "number" type to "integer", fixes #1935 (#2192)
• a211e8d JTD empty values schema, fixes #1949 (#2191)
• Additional commits viewable in compare view

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