🛡️ Sentinel: [HIGH] Fix CWE-400 resource leak in AtTackCraft-Core

[acsoto]

🚨 Severity: HIGH
💡 Vulnerability: CWE-400 (Uncontrolled Resource Consumption). PreparedStatement and ResultSet instances in PlayerListLogger and WhiteList were not properly closed in finally blocks, potentially causing database cursor leaks and resource exhaustion over time.
🎯 Impact: Could lead to Denial of Service (DoS) due to exhausting all available connections to the database, eventually crashing the server.
🔧 Fix: Wrapped the offending PreparedStatement and ResultSet instantiations in standard Java try-with-resources blocks, which automatically guarantees resource closure.
✅ Verification: Ran mvn clean test in AtTackCraft-Core and confirmed it builds successfully. Verified by manual review that try-with-resources accurately replaces previous implementations.

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PR created automatically by Jules for task 17477403384618543765 started by @acsoto

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