Bump ajv from 8.2.0 to 8.3.0

[dependabot[bot]]

Bumps ajv from 8.2.0 to 8.3.0.

Release notes

Sourced from ajv's releases.

v8.3.0

Typescript improvements:

• better error reporting for JSONSchemaType in case strictNullChecks option is disabled (@​erikbrinkman, #1583)
• support missed boolean type in JTDDataType (@​m00s, #1587) JTD timestamp validation option (@​jrr, #1584). Docs corrections.

Commits

• dec8909 8.3.0
• 4ef4804 build(deps-dev): bump @​rollup/plugin-node-resolve from 11.2.1 to 13.0.0 (#1589)
• bfb3e58 build(deps-dev): bump @​types/node from 14.14.44 to 15.0.2 (#1590)
• df964e4 JTD timestamp option (#1584)
• a60eff7 Add boolean support to JTDDataType (#1587)
• 0404a50 correct JTD discriminator docs
• 13730a5 docs: add missing comma in options.md (#1597)
• a2d1974 Fix a typo in the 2020-12 documentation (#1598)
• 380de72 Merge pull request #1579 from sahilda/patch-1
• b3cc337 Merge pull request #1583 from erikbrinkman/snc
• Additional commits viewable in compare view

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