Update examples React to 16.13.1 (#14899)

Fast Refresh doesn't appear to work with older version (16.8.x) versions of React. I was able to reproduce this via this issue https://github.com/vercel/next.js/issues/14895

I updated all examples I found of React `16.8.x` to `^16.13.1` so that future installs will auto bump to the latest minor version. Previously the pinned version was causing the lock of version.

examples/custom-routes-proxying/package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "next": "latest",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   }
 }

examples/dynamic-routing/package.json

@@ -9,7 +9,7 @@
   "license": "ISC",
   "dependencies": {
     "next": "latest",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   }
 }

examples/with-http2/package.json

@@ -8,8 +8,8 @@
   },
   "dependencies": {
     "next": "latest",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   },
   "license": "ISC"
 }

examples/with-linaria/package.json

@@ -10,8 +10,8 @@
     "@zeit/next-css": "^1.0.1",
     "linaria": "2.0.0-alpha.5",
     "next": "latest",
-    "react": "16.8.3",
-    "react-dom": "16.8.3"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   },
   "license": "ISC"
 }

examples/with-rbx-bulma-pro/package.json

@@ -9,7 +9,7 @@
     "bulma-pro": "^0.1.7",
     "next": "^9.1.8-canary.11",
     "rbx": "^2.2.0",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   }
 }

examples/with-zones/blog/package.json

@@ -6,8 +6,8 @@
   },
   "dependencies": {
     "next": "latest",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   },
   "license": "ISC"
 }

examples/with-zones/home/package.json

@@ -6,8 +6,8 @@
   },
   "dependencies": {
     "next": "latest",
-    "react": "16.8.6",
-    "react-dom": "16.8.6"
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1"
   },
   "license": "ISC"
 }