fix:`evm_setNextBlockTimestamp` to return timestamp not in hex format

[dutterbutter]

🐛 Bug Report for zkSync Era In-Memory Node

📝 Description

Currently evm_setNextBlockTimestamp returns timestamp in a hex format.

🔄 Reproduction Steps

1. Make curl request to evm_setNextBlockTimestamp

🤔 Expected Behavior

Should return timestamp as:

{
  "jsonrpc": "2.0",
  "result": 1750074671,
  "id": "1234"
}

😯 Current Behavior

Currently evm_setNextBlockTimestamp returns timestamp in a hex format.

{
  "jsonrpc": "2.0",
  "result": '0x6850052f',
  "id": "1234"
}

🖥️ Environment

• Rust version: [e.g., rustc 1.52.0]
• Operating System & Version: [e.g., Ubuntu 20.04]
• Other relevant environment details:

📋 Additional Context

Add any other context about the problem here. If applicable, add screenshots to help explain.

📎 Log Output

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[MexicanAce]

This is resolved