Bump terser from 5.20.0 to 5.26.0 in /frontend

Bumps [terser](https://github.com/terser/terser) from 5.20.0 to 5.26.0.
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](terser/terser@v5.20.0...v5.26.0)

---
updated-dependencies:
- dependency-name: terser
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

frontend/package.json

@@ -36,7 +36,7 @@
     "jest-environment-jsdom": "^29.7.0",
     "jest-localstorage-mock": "^2.4.26",
     "svelte-jester": "^2.3.2",
-    "terser": "^5.20.0",
+    "terser": "^5.26.0",
     "ts-jest": "^29.1.1",
     "tsc-files": "^1.1.4"
   },