Bump immer from 9.0.5 to 9.0.6 in /plywood/server

Bumps [immer](https://github.com/immerjs/immer) from 9.0.5 to 9.0.6.
- [Release notes](https://github.com/immerjs/immer/releases)
- [Commits](immerjs/immer@v9.0.5...v9.0.6)

---
updated-dependencies:
- dependency-name: immer
  dependency-type: direct:production
...

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

plywood/server/package.json

@@ -30,7 +30,7 @@
     "express": "^4.19.2",
     "has-own-prop": "^1.0.1",
     "http-status": "^1.4.2",
-    "immer": "^9.0.3",
+    "immer": "^9.0.6",
     "immutable": "^4.0.0-rc.14",
     "immutable-class": "^0.9.4",
     "immutable-class-tester": "^0.7.2",