Update dependency @vercel/og to v0.5.18 (#345)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| @​vercel/og | [`0.5.17` -> `0.5.18`](https://renovatebot.com/diffs/npm/@vercel%2fog/0.5.17/0.5.18) | [![age](https://developer.mend.io/api/mc/badges/age/npm/@vercel%2fog/0.5.18?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@vercel%2fog/0.5.18?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@vercel%2fog/0.5.17/0.5.18?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@vercel%2fog/0.5.17/0.5.18?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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package.json

@@ -105,7 +105,7 @@
     "@typescript-eslint/eslint-plugin": "6.7.5",
     "@typescript-eslint/parser": "6.7.5",
     "@vercel/fetch": "7.0.0",
-    "@vercel/og": "0.5.17",
+    "@vercel/og": "0.5.18",
     "@zeit/next-typescript": "1.1.2-canary.0",
     "abort-controller": "3.0.0",
     "alex": "11.0.1",