Update dependency terser to v5.25.0 (#793)

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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)) | [`5.24.0` -> `5.25.0`](https://renovatebot.com/diffs/npm/terser/5.22.0/5.25.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/terser/5.25.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/terser/5.25.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/terser/5.22.0/5.25.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/terser/5.22.0/5.25.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v5.25.0`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5250)

[Compare Source](https://togithub.com/terser/terser/compare/v5.24.0...v5.25.0)

-   Regex properties added to reserved property mangler ([#&#8203;1471](https://togithub.com/terser/terser/issues/1471))
-   `pure_new` option added to drop unused `new` expressions.

### [`v5.24.0`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5240)

[Compare Source](https://togithub.com/terser/terser/compare/v5.23.0...v5.24.0)

-   Improve formatting performance in V8 by keeping a small work string and a large output string

### [`v5.23.0`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5230)

[Compare Source](https://togithub.com/terser/terser/compare/v5.22.0...v5.23.0)

-   When top_retain will keep a variable assignment around, inline the assignee when it's shorter than the name ([#&#8203;1434](https://togithub.com/terser/terser/issues/1434))
-   Remove empty class `static {}` blocks.

</details>

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packages/next/package.json

@@ -298,7 +298,7 @@
     "strip-ansi": "7.1.0",
     "tar": "6.2.0",
     "taskr": "1.1.0",
-    "terser": "5.24.0",
+    "terser": "5.25.0",
     "text-table": "0.2.0",
     "timers-browserify": "2.0.12",
     "tty-browserify": "0.0.1",