fixed deprecated warning for the Buffer.slice method

[victorfreitas]

Moved to Buffer.subarray method of the Buffer API instead of the deprecated (since v16.x) method Buffer.slice.

// Deprecated "slice" method: @since v0.3.0
const buffer = Buffer.from('xxxxx', 'hex');
const bufferPart = buffer.slice(0, 16);

// Recommended "subarray" method: @since v3.0.0
const buffer = Buffer.from('xxxxx', 'hex');
const bufferPart = buffer.subarray(0, 16);

[MauriceButler]

Thanks, released in version v6.3.0