fix(trackerless-network): @streamr/test-utils as dev dependency (#2954)

Moved `@streamr/test-utils` from `dependencies` to `devDependencies`. The package is used only in tests.

Author: teogeb

package-lock.json

@@ -32,7 +32,6 @@
     "@protobuf-ts/runtime-rpc": "^2.8.2",
     "@streamr/dht": "102.0.0-beta.0",
     "@streamr/proto-rpc": "102.0.0-beta.0",
-    "@streamr/test-utils": "102.0.0-beta.0",
     "@streamr/utils": "102.0.0-beta.0",
     "eventemitter3": "^5.0.0",
     "lodash": "^4.17.21",
@@ -42,6 +41,7 @@
   },
   "devDependencies": {
     "@streamr/browser-test-runner": "^0.0.1",
+    "@streamr/test-utils": "102.0.0-beta.0",
     "@types/lodash": "^4.17.13",
     "@types/yallist": "^4.0.1",
     "expect": "^29.6.2",