Updating Node version to 20 in Besu Github actions

Signed-off-by: VRamakrishna <[email protected]>

.github/workflows/test_asset-exchange-besu.yml

@@ -40,10 +40,10 @@ jobs:
           java-version: '11'
           distribution: 'adopt'
 
-      - name: Use Node.js 18.x
+      - name: Use Node.js 20.x
         uses: actions/[email protected]
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - name: Use Protoc 3.15
         run: |
@@ -219,10 +219,10 @@ jobs:
           java-version: '11'
           distribution: 'adopt'
 
-      - name: Use Node.js 18.x
+      - name: Use Node.js 20.x
         uses: actions/[email protected]
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - name: Use Protoc 3.15
         run: |