Try to fix flaky tests

Something is wrong with Jena init...
https://github.com/Jelly-RDF/jelly-jvm/actions/runs/6483252201/job/17604415514

integration-tests/src/test/scala/eu/ostrzyciel/jelly/integration_tests/CrossStreamingSpec.scala

@@ -7,6 +7,7 @@ import org.apache.jena.graph.Graph
 import org.apache.jena.riot.{Lang, RDFDataMgr, RDFParser}
 import org.apache.jena.sparql.core.DatasetGraph
 import org.apache.jena.sparql.util.IsoMatcher
+import org.apache.jena.sys.JenaSystem
 import org.apache.pekko.actor.ActorSystem
 import org.apache.pekko.stream.scaladsl.*
 import org.scalatest.concurrent.ScalaFutures
@@ -23,6 +24,8 @@ class CrossStreamingSpec extends AnyWordSpec, Matchers, ScalaFutures:
   implicit val actorSystem: ActorSystem = ActorSystem()
   implicit val ec: ExecutionContext = actorSystem.getDispatcher
   implicit val defaultPatience: PatienceConfig = PatienceConfig(timeout = 5.seconds, interval = 50.millis)
+
+  JenaSystem.init()
 
   private val implementations: Seq[(String, TestStream)] = Seq(
     ("Jena", JenaTestStream),

integration-tests/src/test/scala/eu/ostrzyciel/jelly/integration_tests/io/IoSerDesSpec.scala

@@ -2,6 +2,7 @@ package eu.ostrzyciel.jelly.integration_tests.io
 
 import eu.ostrzyciel.jelly.core.JellyOptions
 import eu.ostrzyciel.jelly.core.proto.v1.RdfStreamOptions
+import org.apache.jena.sys.JenaSystem
 import org.apache.pekko.actor.ActorSystem
 import org.scalatest.concurrent.ScalaFutures
 import org.scalatest.matchers.should.Matchers
@@ -15,6 +16,8 @@ import java.io.{ByteArrayInputStream, ByteArrayOutputStream, File, FileInputStre
 class IoSerDesSpec extends AnyWordSpec, Matchers, ScalaFutures:
   implicit val as: ActorSystem = ActorSystem("test")
 
+  JenaSystem.init()
+
   val casesTriples: Seq[(String, File)] = Seq[String](
     "weather.nt", "p2_ontology.nt", "nt-syntax-subm-01.nt", "rdf-star.nt", "rdf-star-blanks.nt"
   ).map(name => (