Centralise some more dependencies from plugin-pom.

bom/pom.xml

@@ -47,36 +47,70 @@ THE SOFTWARE.
 
   <dependencyManagement>
     <dependencies>
+      <dependency>
+        <groupId>com.github.spotbugs</groupId>
+        <artifactId>spotbugs-annotations</artifactId>
+        <version>3.1.11</version>
+      </dependency>
+      <dependency>
+        <groupId>net.jcip</groupId>
+        <artifactId>jcip-annotations</artifactId>
+        <version>1.0</version>
+      </dependency>
+      <dependency>
+        <groupId>junit</groupId>
+        <artifactId>junit</artifactId>
+        <version>4.12</version>
+      </dependency>
+      <!--
+        Recommended versions of Mockito and PowerMock for build with Java 11 (JENKINS-55098)
+        The versions require Java 8 as a minimum baseline, but they can be downgraded in plugins if needed.
+      -->
+      <dependency>
+        <groupId>org.mockito</groupId>
+        <artifactId>mockito-core</artifactId>
+        <version>2.28.2</version>
+      </dependency>
+      <dependency>
+        <groupId>org.powermock</groupId>
+        <artifactId>powermock-module-junit4</artifactId>
+        <version>2.0.2</version>
+      </dependency>
+      <dependency>
+        <groupId>org.powermock</groupId>
+        <artifactId>powermock-api-mockito2</artifactId>
+        <version>2.0.2</version>
+      </dependency>
+      <dependency>
+        <groupId>org.objenesis</groupId>
+        <artifactId>objenesis</artifactId>
+        <version>3.0.1</version>
+      </dependency>
       <dependency>
         <groupId>org.apache.ant</groupId>
         <artifactId>ant</artifactId>
         <version>1.9.14</version>
       </dependency>
-
       <dependency>
         <groupId>commons-io</groupId>
         <artifactId>commons-io</artifactId>
         <version>2.6</version>
       </dependency>
-
       <dependency>
         <groupId>commons-lang</groupId>
         <artifactId>commons-lang</artifactId>
         <version>2.6</version>
       </dependency>
-
       <dependency>
         <groupId>commons-httpclient</groupId>
         <artifactId>commons-httpclient</artifactId>
         <version>3.1-jenkins-1</version>
       </dependency>
-
       <dependency>
         <groupId>org.jenkins-ci.main</groupId>
         <artifactId>remoting</artifactId>
         <version>${remoting.version}</version>
       </dependency>
-
       <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
@@ -87,7 +121,6 @@ THE SOFTWARE.
         <artifactId>guava-testlib</artifactId>
         <version>${guavaVersion}</version>
       </dependency>
-
       <dependency>
         <groupId>com.google.inject</groupId>
         <artifactId>guice</artifactId>