Timestamp column not retrieving values in UTC time zone

[rihi]

I believe the recent pull request #2386 tried to fix the behavior of timestamp columns (KotlinInstantColumnType, JavaInstantColumnType) to always store values in UTC.
However, on my system with SQLite, retrieving timestamps from a database results in the UTC timestamps being interpreted as if they were in my system local time zone.

I believe the cause to be the following lines of code:

Exposed/exposed-kotlin-datetime/src/main/kotlin/org/jetbrains/exposed/sql/kotlin/datetime/KotlinDateColumnType.kt

Lines 393 to 395 in a17743d

	override fun readObject(rs: ResultSet, index: Int): Any? {
	return rs.getTimestamp(index)
	}

Exposed/exposed-java-time/src/main/kotlin/org/jetbrains/exposed/sql/javatime/JavaDateColumnType.kt

Lines 377 to 379 in a17743d

	override fun readObject(rs: ResultSet, index: Int): Any? {
	return rs.getTimestamp(index)
	}

This uses ResultSet#getTimestamp(index), which yields timestamp objects which are in the system local time zone if no calendar object is explicitly passed.