Fix: suppress obsolete API warnings and CA2265 Span null checks #104
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Summary: suppressed obsolete warnings for PrivateKey/SecP256k1 and removed redundant Span null checks (CA2265). All tests pass (1354/1354) on .NET 10.0.1.\n\nChanges: updated project targets to net10.0, added #pragma to suppress CS0612 where necessary, and removed redundant Span null checks.\n\nNotes: I ran the full test suite locally and they all passed. Please review warnings for possible long-term replacements of obsolete APIs.