Modernize to Jenkins 2.440.3 (#405)

pom.xml

@@ -11,7 +11,7 @@
         <revision>1</revision>
         <changelist>999999-SNAPSHOT</changelist>
         <!-- Baseline Jenkins version you use to build the plugin. Users must have this version or newer to run. -->
-        <jenkins.version>2.426.3</jenkins.version>
+        <jenkins.version>2.440.3</jenkins.version>
         <hpi.compatibleSinceVersion>1.9</hpi.compatibleSinceVersion>
     </properties>
     <artifactId>stashNotifier</artifactId>
@@ -80,8 +80,8 @@
         <dependencies>
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
-                <artifactId>bom-2.426.x</artifactId>
-                <version>3208.vb_21177d4b_cd9</version>
+                <artifactId>bom-2.440.x</artifactId>
+                <version>3221.ve8f7b_fdd149d</version>
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>