fix(deps): bump core-js from 3.26.0 to 3.26.1 in /frontend (#1823)

Bumps [core-js](https://github.com/zloirock/core-js/tree/HEAD/packages/core-js) from 3.26.0 to 3.26.1.
- [Release notes](https://github.com/zloirock/core-js/releases)
- [Changelog](https://github.com/zloirock/core-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zloirock/core-js/commits/v3.26.1/packages/core-js)

---
updated-dependencies:
- dependency-name: core-js
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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frontend/package.json

@@ -25,7 +25,7 @@
     "@nuxtjs/pwa": "^3.3.5",
     "@vue/composition-api": "^1.7.0",
     "@vueuse/core": "^9.5.0",
-    "core-js": "^3.26.0",
+    "core-js": "^3.26.1",
     "date-fns": "^2.29.3",
     "fuse.js": "^6.6.2",
     "isomorphic-dompurify": "^0.23.0",