chore: Update default value of simulated LTS JENKINS_VERSION in Jenki...

... nsfile

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Author: github-actions[bot]

Jenkinsfile

@@ -33,7 +33,7 @@ if (SIMULATE_LTS_BUILD) {
         'PUBLISH=false',
         'TAG_NAME=2.504.3',
         // TODO: replace by the first LTS based on 2.534+ when available
-        'JENKINS_VERSION=2.504.3',
+        'JENKINS_VERSION=2.528.1',
         'WAR_SHA=d630dca265f75a8d581f127a9234f1679d4b0800a8f370d03ad4a154ceb7295b',
         // Filter out golden file based testing
         // To filter out all tests, set BATS_FLAGS="--filter-tags none"