chore(deps): update dependency sinon to v15 (#39)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sinon](https://sinonjs.org/) ([source](https://togithub.com/sinonjs/sinon)) | [`^14.0.0` -> `^15.0.0`](https://renovatebot.com/diffs/npm/sinon/14.0.2/15.0.1) | [![age](https://badges.renovateapi.com/packages/npm/sinon/15.0.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/sinon/15.0.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/sinon/15.0.1/compatibility-slim/14.0.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/sinon/15.0.1/confidence-slim/14.0.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>sinonjs/sinon</summary>

### [`v15.0.1`](https://togithub.com/sinonjs/sinon/blob/HEAD/CHANGES.md#&#8203;1501)

[Compare Source](https://togithub.com/sinonjs/sinon/compare/v15.0.0...v15.0.1)

-   [`aa493da4`](https://togithub.com/sinonjs/sinon/commit/aa493da47d788025c0d512696651072973f301ec)
    Upgrade to fake-timers v10.0.2 (Carl-Erik Kopseng)
    > Contains several fixes
-   [`b3ee0aa5`](https://togithub.com/sinonjs/sinon/commit/b3ee0aa5c84e7c0f5203591e1507bd1015208925)
    Use Node version 18 in Runkit examples (Carl-Erik Kopseng)

*Released by [Carl-Erik Kopseng](https://togithub.com/fatso83) on 2022-12-15.*

### [`v15.0.0`](https://togithub.com/sinonjs/sinon/blob/HEAD/CHANGES.md#&#8203;1500)

[Compare Source](https://togithub.com/sinonjs/sinon/compare/v14.0.2...v15.0.0)

-   [`b75fbfa9`](https://togithub.com/sinonjs/sinon/commit/b75fbfa9e57ba9b9c1b639b68646b1d054e0a7e3)
    Fix 2448: remove custom formatter (Morgan Roderick)
    > Remove option to pass a custom formatter.
    >
    > The sub libraries of Sinon has long moved on to use `util.inspect` from
    > Node. By using that in Sinon itself, we align all the libraries.

*Released by Morgan Roderick on 2022-11-28.*

</details>

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packages/google-cloud-run/package.json

@@ -51,7 +51,7 @@
     "mocha": "^10.0.0",
     "null-loader": "^4.0.0",
     "pack-n-play": "^1.0.0-2",
-    "sinon": "^14.0.0",
+    "sinon": "^15.0.0",
     "ts-loader": "^9.0.0",
     "typescript": "^4.6.4",
     "webpack": "^5.0.0",