chore: bump serialize-javascript and @rollup/plugin-terser (#5916)

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 7.0.5 and updates ancestor dependency [@rollup/plugin-terser](https://github.com/rollup/plugins/tree/HEAD/packages/terser). These dependencies need to be updated together.


Updates `serialize-javascript` from 6.0.2 to 7.0.5
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v6.0.2...v7.0.5)

Updates `@rollup/plugin-terser` from 0.4.4 to 1.0.0
- [Changelog](https://github.com/rollup/plugins/blob/master/packages/terser/CHANGELOG.md)
- [Commits](https://github.com/rollup/plugins/commits/beep-v1.0.0/packages/terser)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-version: 7.0.5
  dependency-type: indirect
- dependency-name: "@rollup/plugin-terser"
  dependency-version: 1.0.0
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "@lit-labs/analyzer": "^0.12.1",
     "@rollup/plugin-multi-entry": "^6.0.1",
     "@rollup/plugin-node-resolve": "^15.2.3",
-    "@rollup/plugin-terser": "^0.4.4",
+    "@rollup/plugin-terser": "^1.0.0",
     "@types/jasmine": "^4.0.3",
     "@types/node": "^24.10.1",
     "@web/test-runner": "^0.18.2",