fix: specify nbformat version in nb (#2023)

# What does this PR do?
Adding nbformat version fixes this issue. Not sure exactly why this
needs to be done, but this version was rewritten to the bottom of a nb
file when I changed its name trying to get to the bottom of this. When I
opened it on GH the issue was no longer present
 Closes #1837 

## Test Plan
N/A

docs/zero_to_hero_guide/00_Inference101.ipynb

@@ -389,5 +389,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.10.15"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/01_Local_Cloud_Inference101.ipynb

@@ -256,5 +256,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.10.15"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/02_Prompt_Engineering101.ipynb

@@ -301,5 +301,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.12.2"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/03_Image_Chat101.ipynb

@@ -200,5 +200,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.12.2"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/04_Tool_Calling101.ipynb

@@ -355,5 +355,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.10.15"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/05_Memory101.ipynb

@@ -398,5 +398,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.10.15"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/06_Safety101.ipynb

@@ -132,5 +132,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.11.10"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }

docs/zero_to_hero_guide/07_Agents101.ipynb

@@ -188,5 +188,7 @@
       "pygments_lexer": "ipython3",
       "version": "3.10.15"
     }
-  }
+  },
+  "nbformat": 4,
+  "nbformat_minor": 5
 }