Build(deps): Bump webpack in /app/assets/javascripts (#20999)

Bumps [webpack](https://github.com/webpack/webpack) from 5.77.0 to 5.78.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v5.77.0...v5.78.0)

---
updated-dependencies:
- dependency-name: webpack
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

app/assets/javascripts/admin/package.json

@@ -18,7 +18,7 @@
     "ember-auto-import": "^2.6.2",
     "ember-cli-babel": "^7.26.10",
     "ember-cli-htmlbars": "^6.2.0",
-    "webpack": "^5.77.0",
+    "webpack": "^5.78.0",
     "xss": "^1.0.14"
   },
   "devDependencies": {