Update Web3j dependecies and plugins (#9740)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

Author: fab-10

acceptance-tests/tests/build.gradle

@@ -12,8 +12,8 @@
  */
 
 plugins {
-  id 'org.web3j' version '4.14.0'
-  id 'org.web3j.solidity' version '0.6.0'
+  id 'org.web3j' version '5.0.2'
+  id 'org.web3j.solidity' version '0.6.1'
 }
 
 web3j { generatedPackageName = 'org.hyperledger.besu.tests.web3j.generated' }

acceptance-tests/tests/shanghai/build.gradle

@@ -1,7 +1,7 @@
 
 plugins {
-  id 'org.web3j' version '4.14.0'
-  id 'org.web3j.solidity' version '0.6.0'
+  id 'org.web3j' version '5.0.2'
+  id 'org.web3j.solidity' version '0.6.1'
 }
 
 jar { enabled = true }