Enable Vector tests for ScyllaDB 2025.4

[sylwiaszunejko]

Right now Vector related tests in TestSerializersTests.cs e.g. VectorPreparedStatementTest are not executed against ScyllaDB.

[Test, TestCassandraVersion(5, 0), TestCaseSource(nameof(VectorTestCaseData))]

This kind of headers should be extended to also have TestScyllaVErsion(2025,4)