Bump immer from 8.0.4 to 9.0.6 in /election/web (#251)

Bumps [immer](https://github.com/immerjs/immer) from 8.0.4 to 9.0.6.
- [Release notes](https://github.com/immerjs/immer/releases)
- [Commits](immerjs/immer@v8.0.4...v9.0.6)

---
updated-dependencies:
- dependency-name: immer
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

election/web/package.json

@@ -28,7 +28,7 @@
     "date-fns": "^2.14.0",
     "date-fns-tz": "^1.0.10",
     "fast-deep-equal": "^3.1.3",
-    "immer": "^8.0.1",
+    "immer": "^9.0.6",
     "lodash": "^4.17.15",
     "luxon": "^1.25.0",
     "mobx": "^6.1.4",