Update dependency terser to v5.31.0 (#1821)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [terser](https://terser.org) ([source](https://togithub.com/terser/terser)) | [`5.30.4` -> `5.31.0`](https://renovatebot.com/diffs/npm/terser/5.30.3/5.31.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/terser/5.31.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/terser/5.31.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/terser/5.30.3/5.31.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/terser/5.30.3/5.31.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>terser/terser (terser)</summary>

### [`v5.31.0`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5310)

[Compare Source](https://togithub.com/terser/terser/compare/v5.30.4...v5.31.0)

-   Sync up property mangler exceptions with current contents of Firefox and Chrome environments
-   Add more webcomponent properties to property mangler exceptions ([#&#8203;1525](https://togithub.com/terser/terser/issues/1525))
-   Drop non-nullish constants in `...spreads` in objects ([#&#8203;1141](https://togithub.com/terser/terser/issues/1141))

### [`v5.30.4`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5304)

[Compare Source](https://togithub.com/terser/terser/compare/v5.30.3...v5.30.4)

-   Fix parsing `#private in ...` when next to other operators

</details>

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packages/next/package.json

@@ -298,7 +298,7 @@
     "strip-ansi": "7.1.0",
     "tar": "7.0.1",
     "taskr": "1.1.0",
-    "terser": "5.30.4",
+    "terser": "5.31.0",
     "text-table": "0.2.0",
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",