update all dependencies (maven artifacts)

- PDF dependency was missing in the pom file the JDK8
  * We should think about creating a parent pom - in that case all plantuml dependencies could be in the parent pom and we would only the mantain one pom file.
    (It is also possible to drop the Java 8 support.)
  * Why do we not have any PDF tests?
- add rule to ignore version update hint with `-dev` followed by a dot and date (e.g. `0.37.0-dev.20230308`)
- migration from JUnit4 to JUnit5

src/test/java/net/sourceforge/plantuml/servlet/TestMap.java

@@ -4,6 +4,9 @@ import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;
 
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
 import net.sourceforge.plantuml.servlet.utils.TestUtils;
 import net.sourceforge.plantuml.servlet.utils.WebappTestCase;
 
@@ -16,6 +19,7 @@ public class TestMap extends WebappTestCase {
      * participant Bob [[http://www.yahoo.com]]
      * Bob -> Alice : [[http://www.google.com]] hello
      */
+    @Test
     public void testSimpleSequenceDiagram() throws IOException {
         final URL url = new URL(
             getServerUrl() +
@@ -24,30 +28,31 @@ public class TestMap extends WebappTestCase {
         final URLConnection conn = url.openConnection();
         // Analyze response
         // Verifies the Content-Type header
-        assertEquals(
-            "Response content type is not TEXT PLAIN or UTF-8",
+        Assertions.assertEquals(
             "text/plain;charset=utf-8",
-            conn.getContentType().toLowerCase()
+            conn.getContentType().toLowerCase(),
+            "Response content type is not TEXT PLAIN or UTF-8"
         );
         // Get the content, check its first characters and verify its size
         String diagram = getContentText(conn);
-        assertTrue(
-            "Response content is not starting with <map",
-            diagram.startsWith("<map")
+        Assertions.assertTrue(
+            diagram.startsWith("<map"),
+            "Response content is not starting with <map"
         );
-        assertTrue(
-            "Response content (2. line) is not starting with <area",
-            diagram.split("\\n", 2)[1].startsWith("<area")
+        Assertions.assertTrue(
+            diagram.split("\\n", 2)[1].startsWith("<area"),
+            "Response content (2. line) is not starting with <area"
         );
         int diagramLen = diagram.length();
-        assertTrue(diagramLen > 200);
-        assertTrue(diagramLen < 300);
+        Assertions.assertTrue(diagramLen > 200);
+        Assertions.assertTrue(diagramLen < 300);
     }
 
     /**
      * Check the content of the MAP for the sequence diagram sample
      * Verify structure of the area tags
      */
+    @Test
     public void testSequenceDiagramContent() throws IOException {
         final URL url = new URL(
             getServerUrl() +
@@ -61,9 +66,9 @@ public class TestMap extends WebappTestCase {
         // <area shape="..." id="..." href="..." ... />
         // <area shape="..." id="..." href="..." ... />
         // </map>
-        assertTrue(
-            "Response doesn't match shape",
-            map.matches("^<map id=\".+\" name=\".+\">\n(<area shape=\".+\" id=\".+\" href=\".+\".*/>\n){2}</map>\n*$")
+        Assertions.assertTrue(
+            map.matches("^<map id=\".+\" name=\".+\">\n(<area shape=\".+\" id=\".+\" href=\".+\".*/>\n){2}</map>\n*$"),
+            "Response doesn't match shape"
         );
     }
 
@@ -71,20 +76,21 @@ public class TestMap extends WebappTestCase {
      * Check the empty MAP of a sequence diagram without link
      * This test uses the simple Bob -> Alice
      */
+    @Test
     public void testSequenceDiagramWithoutLink() throws IOException {
         final URL url = new URL(getServerUrl() + "/map/" + TestUtils.SEQBOB);
         final URLConnection conn = url.openConnection();
         // Analyze response
         // Verifies the Content-Type header
-        assertEquals(
-            "Response content type is not TEXT PLAIN or UTF-8",
+        Assertions.assertEquals(
             "text/plain;charset=utf-8",
-            conn.getContentType().toLowerCase()
+            conn.getContentType().toLowerCase(),
+            "Response content type is not TEXT PLAIN or UTF-8"
         );
         // Get the data contained in the XML
         String diagram = getContentText(conn);
         int diagramLen = diagram.length();
-        assertEquals(0, diagramLen);
+        Assertions.assertEquals(0, diagramLen);
     }
 
 }