fix(connector-besu): toBuffer only supports 0x-prefixed hex

Primary Changes
---------------
1. Updated private-deploy-contract-from-json-web3-eea.test.ts gaslimit from
3000000 to its hex equivalent

fixes: #2791

Signed-off-by: ruzell22 <[email protected]>

Author: ruzell22

packages/cactus-plugin-ledger-connector-besu/src/test/typescript/integration/plugin-ledger-connector-besu/deploy-contract/private-deploy-contract-from-json-web3-eea.test.ts

@@ -109,7 +109,7 @@ test(testCase, async (t: Test) => {
         keys.tessera.member2.publicKey,
       ],
       privateKey: keys.besu.member1.privateKey,
-      gasLimit: "3000000",
+      gasLimit: "0x2DC6C0",
     });
 
   t.ok(commitmentHash, "commitmentHash truthy OK");