[jOOQ/jOOQ#8732] H2: Fix DSL#week() implementation

For H2 the DSL#week() function should be mapped to the ISO_WEEK()
function as EXTRACT(WEEK FROM ...) is equivalent to the WEEK() function.

jOOQ/src/main/java/org/jooq/impl/Extract.java

@@ -342,6 +342,8 @@ final class Extract extends AbstractFunction<Integer> {
 
                     case QUARTER:
                         return DSL.field("{quarter}({0})", INTEGER, field);
+                    case WEEK:
+                        return DSL.field("{iso_week}({0})", INTEGER, field);
 
                     default:
                         return getNativeFunction();