Implement updates for better performance

Author: abrar2030

code/blockchain/package-lock.json

@@ -0,0 +1,8 @@
+{
+  "devDependencies": {
+    "solc": "^0.8.0"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts": "^4.9.6"
+  }
+}

code/blockchain/package.json

@@ -8,7 +8,7 @@ module.exports = {
   },
   compilers: {
     solc: {
-      version: "0.8.0",
+      version: "0.8.19",
       settings: {
         optimizer: {
           enabled: true,