fix a couple of invalid notebooks

found via validation in  #6045

examples/Notebook/Raw Input.ipynb

@@ -48,7 +48,6 b''
      "metadata": {},
      "outputs": [
       {
-       "name": "stdout",
        "output_type": "stream",
        "stream": "stdout",
        "text": [
@@ -84,7 +83,6 b''
      "metadata": {},
      "outputs": [
       {
-       "name": "stdout",
        "output_type": "stream",
        "stream": "stdout",
        "text": [
@@ -149,7 +147,6 b''
        ]
       },
       {
-       "name": "stdout",
        "output_type": "stream",
        "stream": "stdout",
        "text": [
@@ -164,7 +161,6 b''
        ]
       },
       {
-       "name": "stdout",
        "output_type": "stream",
        "stream": "stdout",
        "text": [
@@ -179,7 +175,6 b''
        ]
       },
       {
-       "name": "stdout",
        "output_type": "stream",
        "stream": "stdout",
        "text": [

tools/tests/heartbeat/gilsleep.ipynb

@@ -52,7 +52,7 b''
      "language": "python",
      "metadata": {},
      "outputs": [],
-     "prompt_number": " "
+     "prompt_number": null
     }
    ],
    "metadata": {}