Change JdbcTest.testVersion to strictly match minor version in gradle.properties

A recent bump of calcite.version to 1.40.0 broke JdbcTest.test version cause the following condition was no longer true.

    assertTrue(driverMinor >= 0 && driverMinor < 40);

If we want to test that versions in properties really match those in JDBC it makes more sense to have strict equality instead of range. The drawback is that we have to update the test after every version bump.