Require Jenkins 2.504.3 or newer

Automated tests fail with command line git 2.51.0 because the plugin
depends on an older version of the git plugin and thus has an older
version of the git client plugin.

Use the most recent git client plugin so that CLI git 2.51.0 is
supported.

Author: MarkEWaite

pom.xml

@@ -63,7 +63,7 @@ THE SOFTWARE.
     </pluginRepositories>
     <properties>
         <changelist>999999-SNAPSHOT</changelist>
-        <jenkins.baseline>2.479</jenkins.baseline>
+        <jenkins.baseline>2.504</jenkins.baseline>
         <jenkins.version>${jenkins.baseline}.3</jenkins.version>
         <no-test-jar>false</no-test-jar>
         <gitHubRepo>jenkinsci/${project.artifactId}-plugin</gitHubRepo>
@@ -74,7 +74,7 @@ THE SOFTWARE.
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
                 <artifactId>bom-${jenkins.baseline}.x</artifactId>
-                <version>5054.v620b_5d2b_d5e6</version>
+                <version>5388.v3ea_2e00a_719a_</version>
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>