Bump ajv from 6.10.0 to 6.12.6 in /_materials_/gulp-starter#12

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dependabot/npm_and_yarn/_materials_/gulp-starter/ajv-6.12.6andrew-ml/synergy-frontend-spring:dependabot/npm_and_yarn/_materials_/gulp-starter/ajv-6.12.6Copy head branch name to clipboard