Changelog for 2.303.2

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Community feedback:

Security fixes. (security advisory)
Security hardening: The "short description" of build causes is now defined as plain text instead of HTML. (related LTS upgrade guide entry, related developer documentation)
Allow Jenkins to start when the JCasC configuration defines view-related permissions (regression in 2.302). (issue 66470)
Use the JVM's default keystore type for the Jenkins server when terminating TLS connections within Jenkins. Used if Jenkins is started with the --httpsPort argument. Winstone 5.21: Update Jetty from 9.4.42.v20210604 to Jetty 9.4.43.v20210629. (pull 5670, issue 66379 , Winstone 5.20 changelog, Winstone 5.21 changelog, Jetty 9.4.43 changelog)
Fix wrong parameter type for Text Parameter when triggering a build via the buildWithParameters API call. (pull 5704)
Bump bundled Ant from 1.10.10 to 1.10.11. (pull 5620)
Upgrade from xstream 1.4.17 to 1.4.18. (pull 5685, issue 66507 , XStream 1.4.18)