Update iText and JUnit dependencies

FilePathPreProcessorTest was altered to match the others because of the
itextpdf pdftest changes. It also now uses JUnit 5 APIs.

List of updated dependencies:
* com.itextpdf:bouncy-castle-adapter:8.0.5 > 9.1.0
* com.itextpdf:io:8.0.5 > 9.1.0
* com.itextpdf:kernel:8.0.5 > 9.1.0
* com.itextpdf:pdftest:8.0.5 > 9.1.0
* org.junit.jupiter:junit-jupiter-api:5.11.0 > 5.12.0
* org.junit.jupiter:junit-jupiter-engine:5.11.0 > 5.12.0
* org.junit.jupiter:junit-jupiter-params:5.11.0 > 5.12.0

Author: Eswcvlad

pom.xml

@@ -78,12 +78,12 @@
     <dom4j.version>2.1.4</dom4j.version>
     <flatlaf.version>3.5.4</flatlaf.version>
     <icu4j.version>76.1</icu4j.version>
-    <itext.version>8.0.5</itext.version>
+    <itext.version>9.1.0</itext.version>
     <jackson.version>2.18.2</jackson.version>
     <logback.version>1.5.17</logback.version>
 
     <!-- Test dependencies -->
-    <junit-jupiter-api.version>5.11.0</junit-jupiter-api.version>
+    <junit-jupiter-api.version>5.12.0</junit-jupiter-api.version>
   </properties>
 
   <dependencies>

src/test/java/com/itextpdf/rups/model/FilePathPreProcessorTest.java

@@ -43,18 +43,17 @@ This file is part of the iText (R) project.
 package com.itextpdf.rups.model;
 
 import com.itextpdf.test.ExtendedITextTest;
-import com.itextpdf.test.annotations.type.UnitTest;
 
 import java.util.stream.Stream;
-import org.junit.Test;
-import org.junit.experimental.categories.Category;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
-@Category(UnitTest.class)
+@Tag("UnitTest")
 public class FilePathPreProcessorTest extends ExtendedITextTest {
 
     @Test