Bump @openapitools/openapi-generator-cli from 2.19.1 to 2.20.0#4

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dependabot/npm_and_yarn/openapitools/openapi-generator-cli-2.20.0NHSDigital/eligibility-signposting-api-specification:dependabot/npm_and_yarn/openapitools/openapi-generator-cli-2.20.0Copy head branch name to clipboard