Require Jenkins 2.426.3 or newer

https://stats.jenkins.io/pluginversions/ivy.html shows that 67% of the
installations of the 2.5 release are already using Jenkins 2.426.3.

https://www.jenkins.io/security/advisory/2024-01-24/#SECURITY-3314 is
a critical vulnerability that is resolved in 2.426.3.  The advisory
recommends that all users upgrade to 2.426.3 or newer.

pom.xml

@@ -46,7 +46,7 @@
   <properties>
     <revision>2.6</revision>
     <changelist>-SNAPSHOT</changelist>
-    <jenkins.version>2.375.4</jenkins.version>
+    <jenkins.version>2.426.3</jenkins.version>
     <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
     <!-- TODO fix violations -->
     <spotbugs.threshold>High</spotbugs.threshold>
@@ -57,8 +57,8 @@
     <dependencies>
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
-        <artifactId>bom-2.375.x</artifactId>
-        <version>2198.v39c76fc308ca</version>
+        <artifactId>bom-2.426.x</artifactId>
+        <version>3023.v02a_987a_b_3ff9</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>