align to LTS and pickup bom with fixed subversion

when running tests with PCT issues with subversion are found as it can
not resolve trilead classes.

update the bom to pickup https://github.com/jenkinsci/subversion-plugin/releases/tag/1256.vee91953217b_6

pom.xml

@@ -63,25 +63,19 @@ THE SOFTWARE.
     </pluginRepositories>
     <properties>
         <changelist>999999-SNAPSHOT</changelist>
-        <jenkins.version>2.444</jenkins.version>
+        <jenkins.version>2.452.2</jenkins.version>
         <no-test-jar>false</no-test-jar>
         <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
     </properties>
     <dependencyManagement>
         <dependencies>
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
-                <artifactId>bom-2.440.x</artifactId>
-                <version>2746.vb_79a_1d3e7b_c8</version>
+                <artifactId>bom-2.452.x</artifactId>
+                <version>3010.vec758b_8e7da_3</version>
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>
-            <!-- TODO until in BOM -->
-            <dependency>
-                <groupId>org.jenkins-ci.plugins</groupId>
-                <artifactId>cloudbees-folder</artifactId>
-                <version>6.919.va_e17e72383f5</version>
-            </dependency>
         </dependencies>
     </dependencyManagement>
     <dependencies>