Bump dotenv-webpack from 7.1.1 to 8.1.0 in /frontend/packages/build

Bumps [dotenv-webpack](https://github.com/mrsteele/dotenv-webpack) from 7.1.1 to 8.1.0.
- [Release notes](https://github.com/mrsteele/dotenv-webpack/releases)
- [Commits](mrsteele/dotenv-webpack@v7.1.1...v8.1.0)

---
updated-dependencies:
- dependency-name: dotenv-webpack
  dependency-version: 8.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/packages/build/package.json

@@ -15,7 +15,7 @@
     "compression-webpack-plugin": "^9.0.0",
     "copy-webpack-plugin": "^10.0.0",
     "cssnano": "^5.0.2",
-    "dotenv-webpack": "^7.0.1",
+    "dotenv-webpack": "^8.1.0",
     "fork-ts-checker-webpack-plugin": "^7",
     "html-webpack-plugin": "^5.4.0",
     "style-loader": "^3.0.0",