Use var for local variables initialized with constructor in tests

Use this link to re-run the recipe: https://app.moderne.io/builder/9uwIjLvVE?organizationId=QUxML01vZGVybmUvTW9kZXJuZSArIE9wZW5SZXdyaXRl

Co-authored-by: Moderne <team@moderne.io>

Author: timtebeek

src/test/java/org/openrewrite/jenkins/AddPluginsBomTest.java

@@ -362,7 +362,7 @@ void shouldFixOutdatedPluginsBom() {
 
     @Test
     void shouldFixOutdatedPluginsBomPropertiesBelowManagedDependencies() {
-        ModernizePluginTest.Versions versionsBefore = new ModernizePluginTest.Versions(
+        var versionsBefore = new ModernizePluginTest.Versions(
           "4.86",
           "2.440.3",
           "bom-2.346.x",

src/test/java/org/openrewrite/jenkins/ModernizePluginTest.java

@@ -65,7 +65,7 @@ public void defaults(RecipeSpec spec) {
     @DocumentExample
     @Test
     void shouldDoTheWorks() {
-        Versions versionsBefore = new Versions(
+        var versionsBefore = new Versions(
           "4.75",
           "2.387.3",
           "bom-2.387.x",