Bump yargs-parser and ts-jest in /textract-pipeline#59

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dependabot/npm_and_yarn/textract-pipeline/yargs-parser-and-ts-jest-21.1.1aws-samples/amazon-textract-serverless-large-scale-document-processing:dependabot/npm_and_yarn/textract-pipeline/yargs-parser-and-ts-jest-21.1.1Copy head branch name to clipboard