Bump jenkins.version from 2.450 to 2.451

Bumps `jenkins.version` from 2.450 to 2.451.

Updates `org.jenkins-ci.main:jenkins-core` from 2.450 to 2.451
- [Release notes](https://github.com/jenkinsci/jenkins/releases)
- [Commits](jenkinsci/jenkins@jenkins-2.450...jenkins-2.451)

Updates `org.jenkins-ci.main:jenkins-war` from 2.450 to 2.451
- [Release notes](https://github.com/jenkinsci/jenkins/releases)
- [Commits](jenkinsci/jenkins@jenkins-2.450...jenkins-2.451)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.main:jenkins-core
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: org.jenkins-ci.main:jenkins-war
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -26,7 +26,7 @@
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
     <gitHubRepo>jenkinsci/plugin-compat-tester</gitHubRepo>
-    <jenkins.version>2.450</jenkins.version>
+    <jenkins.version>2.451</jenkins.version>
     <picocli.version>4.7.5</picocli.version>
     <slf4j.version>2.0.12</slf4j.version>
     <spotbugs.effort>Max</spotbugs.effort>