Update dependency org.jenkins-ci.plugins:matrix-project to v870 (jenkinsci#11182)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Kris Stern <krisstern@outlook.com>

Author: renovate[bot]

test/pom.xml

@@ -262,7 +262,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>matrix-project</artifactId>
-      <version>867.vc7ec936160ee</version>
+      <version>870.v9db_fcfc2f45b_</version>
       <scope>test</scope>
     </dependency>
     <dependency>

war/pom.xml

@@ -304,7 +304,7 @@ THE SOFTWARE.
                   <!-- detached after 1.561 -->
                   <groupId>org.jenkins-ci.plugins</groupId>
                   <artifactId>matrix-project</artifactId>
-                  <version>867.vc7ec936160ee</version>
+                  <version>870.v9db_fcfc2f45b_</version>
                   <type>hpi</type>
                 </artifactItem>
                 <artifactItem>