chore: fix date syntax

Author: wackerow

src/data/externalTutorials.json

@@ -11,7 +11,7 @@
     "skillLevel": "intermediate",
     "timeToRead": "11",
     "lang": "en",
-    "publishDate": "5/29/2024"
+    "publishDate": "05/29/2024"
   },
   {
     "url": "https://www.youtube.com/watch?v=LmQTRGqUL9s",
@@ -25,7 +25,7 @@
     "skillLevel": "intermediate",
     "timeToRead": "10",
     "lang": "en",
-    "publishDate": "5/29/2024"
+    "publishDate": "05/29/2024"
   },
   {
     "url": "https://updraft.cyfrin.io/courses/security",