chore: update link and time to read

Co-authored-by: Patrick Collins <54278053+PatrickAlphaC@users.noreply.github.com>

src/data/externalTutorials.json

@@ -1,6 +1,6 @@
 [
   {
-    "url": "https://medium.com/cyfrin/what-is-eip-4844-proto-dankshading-and-blob-transactions-explained-984dec50dcc8",
+    "url": "https://www.cyfrin.io/blog/what-is-eip-4844-proto-danksharding-and-blob-transactions",
     "title": "What is EIP-4844? Proto-Danksharding and blob transactions explained",
     "description": "What is the EIP-4844? Learn what proto-danksharding and blobs are, how they work, and how to send your first blob transaction using the new Ethereum improvement proposal",
     "author": "Patrick Collins",
@@ -9,7 +9,7 @@
       "layer 2"
     ],
     "skillLevel": "intermediate",
-    "timeToRead": "660",
+    "timeToRead": "11",
     "lang": "en",
     "publishDate": "5/29/2024"
   },
@@ -23,7 +23,7 @@
       "layer 2"
     ],
     "skillLevel": "intermediate",
-    "timeToRead": "600",
+    "timeToRead": "10",
     "lang": "en",
     "publishDate": "5/29/2024"
   },