Deprecate classes supporting H2 1.x.

Support for the 1.x branch of H2 will be dropped with the next major release.

See #1243

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/dialect/H2TimestampWithTimeZoneToOffsetDateTimeConverter.java

@@ -23,13 +23,15 @@ import org.springframework.core.convert.converter.Converter;
 import org.springframework.data.convert.ReadingConverter;
 
 /**
- * Converter converting from an H2 internal representation of a timestamp with time zone to an OffsetDateTime.
- *
- * Only required for H2 versions < 2.0
+ * Converter converting from an H2 internal representation of a timestamp with time zone to an OffsetDateTime. Only
+ * required for H2 versions < 2.0
  * 
  * @author Jens Schauder
  * @since 2.7
+ * @deprecated This is only used for H2 1.x support which will be dropped with the next major release. Use H2Dialect
+ *             instead.
  */
+@Deprecated
 @ReadingConverter
 public enum H2TimestampWithTimeZoneToOffsetDateTimeConverter
 		implements Converter<TimestampWithTimeZone, OffsetDateTime> {

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/dialect/JdbcH2Dialect.java

@@ -28,7 +28,10 @@ import org.springframework.data.relational.core.dialect.H2Dialect;
  * @author Jens Schauder
  * @author Christoph Strobl
  * @since 2.3
+ * @deprecated This is only used for H2 1.x support which will be dropped with the next major release. Use H2Dialect
+ *             instead.
  */
+@Deprecated
 public class JdbcH2Dialect extends H2Dialect {
 
 	public static JdbcH2Dialect INSTANCE = new JdbcH2Dialect();