[JENKINS-53055] Upgrade libpam4j dependency (jenkinsci#3589)

* Upgrade to libpam4j 1.11

* Remove libpam4j from core dependencies

This dependency is no longer used ever since PAM authn/authz support
was extracted into the pam-auth-plugin years ago. This reduces the need
to keep security libraries up to date in multiple places.

* Revert "Remove libpam4j from core dependencies"

This reverts commit a7c7a52.

core/pom.xml

@@ -545,7 +545,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>org.kohsuke</groupId>
       <artifactId>libpam4j</artifactId>
-      <version>1.8</version>
+      <version>1.11</version>
     </dependency>
     <dependency>
       <groupId>org.kohsuke</groupId>