Bump vega-interpreter from 1.0.4 to 1.2.1 in /tfjs-data/demo/boston-housing#8599

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dependabot/npm_and_yarn/tfjs-data/demo/boston-housing/vega-interpreter-1.2.1tensorflow/tfjs:dependabot/npm_and_yarn/tfjs-data/demo/boston-housing/vega-interpreter-1.2.1Copy head branch name to clipboard