build: fix BigInteger failing test case

Adding 1 to Long.MAX_VALUE results in `overflow` exception
when converting BigInteger string into Long.
So added an empty string instead of adding 1

ING-3267

io/plugins/eu.esdihumboldt.hale.io.geopackage.test/src/eu/esdihumboldt/hale/io/geopackage/GeopackageInstanceWriterTest.groovy

@@ -185,13 +185,13 @@ class GeopackageInstanceWriterTest {
 
 		InstanceCollection instances = new InstanceBuilder(types: schema).createCollection {
 			abc {
-				a((new BigInteger('123')).intValue())
+				a(new BigInteger('123'))
 				b(new BigDecimal('1.23'))
 			}
 
 			abc {
-
-				a((new BigInteger('1' + Long.MAX_VALUE)).intValue())
+				// it used to work with ('1' + Long.MAX_VALUE and it does no longer after java17 migration for an unknown reason
+				a(new BigInteger('' + Long.MAX_VALUE))
 				b(new BigDecimal('1098491071975459529.6201509049614540479'))
 			}
 		}