Bump parent POM from 1.90 to 1.91 (#81)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <groupId>org.jenkins-ci</groupId>
     <artifactId>jenkins</artifactId>
-    <version>1.90</version>
+    <version>1.91</version>
     <relativePath />
   </parent>
 
@@ -67,7 +67,6 @@
     <dependency>
       <groupId>org.hamcrest</groupId>
       <artifactId>hamcrest-core</artifactId>
-      <version>2.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>