fix(deps): update dependency google-gax to v4.2.1 (#1989)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [google-gax](https://togithub.com/googleapis/gax-nodejs) ([source](https://togithub.com/googleapis/gax-nodejs/tree/HEAD/gax)) | [`4.2.0` -> `4.2.1`](https://renovatebot.com/diffs/npm/google-gax/4.2.0/4.2.1) | [![age](https://developer.mend.io/api/mc/badges/age/npm/google-gax/4.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/google-gax/4.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/google-gax/4.2.0/4.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/google-gax/4.2.0/4.2.1?slim=true)](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>googleapis/gax-nodejs (google-gax)</summary> ### [`v4.2.1`](https://togithub.com/googleapis/gax-nodejs/compare/v4.2.0...ae37986ddc9f6c822ff557248cdf68529931abc6) [Compare Source](https://togithub.com/googleapis/gax-nodejs/compare/v4.2.0...ae37986ddc9f6c822ff557248cdf68529931abc6) </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 9am and before 3pm" (UTC), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://developer.mend.io/github/googleapis/nodejs-spanner). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xMzUuMCIsInVwZGF0ZWRJblZlciI6IjM3LjEzNS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Author: renovate-bot

package.json

@@ -65,7 +65,7 @@
  "events-intercept": "^2.0.0",
  "extend": "^3.0.2",
  "google-auth-library": "^9.0.0",
- "google-gax": "4.2.0",
+ "google-gax": "4.2.1",
  "grpc-gcp": "^1.0.0",
  "is": "^3.2.1",
  "lodash.snakecase": "^4.1.1",