[Snyk] Security upgrade is-my-json-valid from 2.18.0 to 2.20.3

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ISMYJSONVALID-597165	No	Proof of Concept
	Arbitrary Code Execution SNYK-JS-ISMYJSONVALID-597167	No	Proof of Concept

Commit messages

Package name: is-my-json-valid

The new version differs by 28 commits.

• 9df4acb 2.20.3
• 3419563 only inline allocated vars
• adf40bd 2.20.2
• c3fc04f limit regex if maxLength is set
• 314a36f test on 12
• 2684bd0 2.20.1
• 0fb366a use maxItems in unique check
• 60111f4 2.20.0
• 8c11f77 Merge pull request #175 from LinusU/meta
• b6d9b3f Cleanup package metadata
• dcea5be 2.19.0
• 1712811 Merge pull request #171 from mafintosh/ts-nullable
• fad4c91 Add nullable types to TypeScript typings
• 484197f Add test for nested object in typings
• 4bec868 Merge pull request #168 from mafintosh/ts-oneof
• e8c30d5 Add support for "oneOf" to TypeScript typings
• 7160756 Merge pull request #167 from mafintosh/ts-required
• 88dad89 Make "required" optional in TypeScript typings
• 45b9708 Fix assertions of union types
• 20b299d Merge pull request #166 from mafintosh/ts-tojson
• 4c39294 Tighten up generic input types
• feed73c Improve type names
• c634f4b Refactor to more verbose naming
• 3da57a4 Refactor away LeafSchema and GenericSchema

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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