GHSA-QW47-MCM5-934W A2A Java SDK has a fail-open default task authorization

Draft text for GHSA-qw47-mcm5-934w. The body below drops into the GitHub advisory description field; the metadata block maps to the form fields. Set the patched version at release; publish when the fix ships. --- - Ecosystem: Maven - Affected package: org.a2aproject.sdk:a2a-java-sdk-server-common...