BlobInputStream does not reset() to correct position if LargeObject was not at position 0.

[OrangeDog]

Describe the issue
The InputStream created from a LargeObject starts from the current position of that object, but the mark and reset functions do not account for this.

Driver Version?
42.7.2

Java Version?
17.0.1

OS Version?
Windows 11

PostgreSQL Version?
14.10

To Reproduce

public class TestMarkReset {
    public static void main(String []args) throws Exception {
        String url = "jdbc:postgresql://localhost:5432/test";

        Properties props = new Properties();
        props.setProperty("user", "test");
        props.setProperty("password", "test");
        try ( Connection conn = DriverManager.getConnection(url, props) ){

            LargeObjectManager lom = ((PGConnection) con).getLargeObjectAPI();
            try (LargeObject blob = lom.open(123456)) {  // contains bytes in ascending order
                assertArrayEquals(new byte[]{0, 1, 2, 3}, blob.read(4));
                InputStream is = blob.getInputStream();
                is.mark(1);
                assertEquals(4, is.read());
                is.reset();
                assertEquals(4, is.read());  // FAILS: 4 != 0
            }

        }
    }
}

Expected behaviour
The stream returns to the marked position, regardless of how it was constructed.