chore: Update Serenity BDD to 5.3.7 and use serenity-bom

Use the new serenity-bom for centralized version management.
Serenity dependency versions are now managed by the BOM import,
removing the need for explicit version tags on each artifact.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: wakaleo

pom.xml

@@ -11,18 +11,28 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <serenity.version>5.3.3</serenity.version>
+        <serenity.version>5.3.7</serenity.version>
         <junit.version>6.0.3</junit.version>
         <cucumber.version>7.34.2</cucumber.version>
         <encoding>UTF-8</encoding>
         <tags></tags>
         <webdriver.base.url></webdriver.base.url>
     </properties>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>net.serenity-bdd</groupId>
+                <artifactId>serenity-bom</artifactId>
+                <version>${serenity.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
     <dependencies>
         <dependency>
             <groupId>net.serenity-bdd</groupId>
             <artifactId>serenity-core</artifactId>
-            <version>${serenity.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -33,25 +43,21 @@
         <dependency>
             <groupId>net.serenity-bdd</groupId>
             <artifactId>serenity-cucumber</artifactId>
-            <version>${serenity.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>net.serenity-bdd</groupId>
             <artifactId>serenity-screenplay</artifactId>
-            <version>${serenity.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>net.serenity-bdd</groupId>
             <artifactId>serenity-screenplay-webdriver</artifactId>
-            <version>${serenity.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>net.serenity-bdd</groupId>
             <artifactId>serenity-ensure</artifactId>
-            <version>${serenity.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>