jtreg 8+2

Changes:

• new upstream release (Closes #1110468)

Testing:

• upstream testing: https://github.com/openjdk/jdk/pull/26261#pullrequestreview-3106980594
• ppa build: https://launchpad.net/~vpa1977/+archive/ubuntu/jtreg8/+packages The PPA build failures align with upstream findings:

FAILED: java/security/SignedJar/spi-calendar-provider/TestSPISigned.java - fails due to hardcoded library tag

FAILED: com/sun/net/httpserver/simpleserver/DocRootDirPermissionsTest.java - chroot-specific builder failure - missing /proc/mounts in LP builder environment (https://bugs.openjdk.org/browse/JDK-8166162)