fix(oracle): use view available for all users for driver.Version

Closes #489 Use v$version instead of v$instance because it is available to all users. Like v$instance, v$version is available in all non-ancient oracle versions. Both are available in the earliest documentation I could find: 10g, released 2003. Testing Done: Oracle Express 21c (as in the reported issue) and 11g For 11g: docker run -d -p 1521:1521 -e ORACLE_PASSWORD=foobar gvenzl/oracle-xe:11-slim ./usql oracle://sys:foobar@localhost/xe # version is shown correctly create user test identified by test; GRANT CREATE SESSION to test; \connect oracle://test:test@localhost/xe # version is still shown correctly, despite minimal privileges 21c in the issue was also tested that way.