Update dependency ajv to v8.12.0 (#149)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [ajv](https://ajv.js.org) ([source](https://togithub.com/ajv-validator/ajv)) | [`8.11.0` -> `8.12.0`](https://renovatebot.com/diffs/npm/ajv/8.11.0/8.12.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/ajv/8.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/ajv/8.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/ajv/8.11.0/8.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/ajv/8.11.0/8.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>ajv-validator/ajv (ajv)</summary>

### [`v8.12.0`](https://togithub.com/ajv-validator/ajv/releases/tag/v8.12.0)

[Compare Source](https://togithub.com/ajv-validator/ajv/compare/v8.11.2...v8.12.0)

-   fix JTD serialisation (remove leading comma in objects with only optional properties) ([#&#8203;2190](https://togithub.com/ajv-validator/ajv/issues/2190), [@&#8203;piliugin-anton](https://togithub.com/piliugin-anton))
-   empty JTD "values" schema ([#&#8203;2191](https://togithub.com/ajv-validator/ajv/issues/2191))
-   empty object to work with JTD utility type ([#&#8203;2158](https://togithub.com/ajv-validator/ajv/issues/2158), [@&#8203;erikbrinkman](https://togithub.com/erikbrinkman))
-   fix JTD "discriminator" schema for objects with more than 8 properties ([#&#8203;2194](https://togithub.com/ajv-validator/ajv/issues/2194))
-   correctly narrow "number" type to "integer" ([#&#8203;2192](https://togithub.com/ajv-validator/ajv/issues/2192), [@&#8203;JacobLey](https://togithub.com/JacobLey))
-   update Node.js versions in CI to 14, 16, 18 and 19

### [`v8.11.2`](https://togithub.com/ajv-validator/ajv/releases/tag/v8.11.2)

[Compare Source](https://togithub.com/ajv-validator/ajv/compare/v8.11.1...v8.11.2)

Update dependencies

Export ValidationError and MissingRefError ([ajv-validator/ajv#1840, [@&#8203;dannyb648](https://togithub.com/dannyb648))

### [`v8.11.1`](https://togithub.com/ajv-validator/ajv/releases/tag/v8.11.1)

[Compare Source](https://togithub.com/ajv-validator/ajv/compare/v8.11.0...v8.11.1)

Update dependencies

Export ValidationError and MissingRefError ([#&#8203;1840](https://togithub.com/ajv-validator/ajv/issues/1840), [@&#8203;dannyb648](https://togithub.com/dannyb648))

</details>

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packages/next/package.json

@@ -193,7 +193,7 @@
     "@vercel/ncc": "0.38.0",
     "@vercel/nft": "0.24.1",
     "acorn": "8.5.0",
-    "ajv": "8.11.0",
+    "ajv": "8.12.0",
     "amphtml-validator": "1.0.35",
     "anser": "1.4.10",
     "arg": "4.1.3",