plugins: migrate react-router dev deps

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: blam <ben@blam.sh>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/todo/package.json

@@ -42,7 +42,8 @@
     "react-use": "^17.2.4"
   },
   "peerDependencies": {
-    "react": "^16.13.1 || ^17.0.0"
+    "react": "^16.13.1 || ^17.0.0",
+    "react-router": "6.0.0-beta.0 || ^6.3.0"
   },
   "devDependencies": {
     "@backstage/cli": "^0.18.2-next.0",
@@ -55,8 +56,7 @@
     "@types/jest": "^26.0.7",
     "@types/node": "^16.11.26",
     "cross-fetch": "^3.1.5",
-    "msw": "^0.45.0",
-    "react-router": "6.0.0-beta.0"
+    "msw": "^0.45.0"
   },
   "files": [
     "dist"