fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - @octokit/rest from 19.0.5 to 19.0.13.
    See this package in npm: https://www.npmjs.com/package/@octokit/rest
  - @google-automations/git-file-utils from 1.2.5 to 1.2.6.
    See this package in npm: https://www.npmjs.com/package/@google-automations/git-file-utils
  - gaxios from 5.0.2 to 5.1.3.
    See this package in npm: https://www.npmjs.com/package/gaxios
  - @google-cloud/bigquery from 6.2.0 to 6.2.1.
    See this package in npm: https://www.npmjs.com/package/@google-cloud/bigquery
  - ajv from 8.12.0 to 8.17.1.
    See this package in npm: https://www.npmjs.com/package/ajv
  - jsonwebtoken from 9.0.0 to 9.0.2.
    See this package in npm: https://www.npmjs.com/package/jsonwebtoken
  - yargs from 17.6.2 to 17.7.2.
    See this package in npm: https://www.npmjs.com/package/yargs

See this project in Snyk:
https://app.snyk.io/org/googlecloud-fD9E4u83kGB6j2zHM2NDFc/project/9188707b-a73e-46e4-adc5-3069b470de88?utm_source=github&utm_medium=referral&page=upgrade-pr