Bump parent POM from 1.76 to 1.77 (#26)

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

Author: dependabot[bot]

Jenkinsfile

@@ -4,7 +4,6 @@
  * allowing one to test against multiple Jenkins versions.
  */
 buildPlugin(useContainerAgent: true, configurations: [
-  [ platform: 'linux', jdk: '8' ],
   [ platform: 'linux', jdk: '11' ],
   [ platform: 'windows', jdk: '11' ],
   [ platform: 'linux', jdk: '17' ],

pom.xml

@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.jenkins-ci</groupId>
     <artifactId>jenkins</artifactId>
-    <version>1.76</version>
+    <version>1.77</version>
     <relativePath />
   </parent>