jtreg 7.5.2

Update jtreg to 7.5.2. The original tarballs are available in PPA https://launchpad.net/~vpa1977/+archive/ubuntu/october-21/+sourcepub/17487419/+listing-archive-extra

Changes:

• update to the latest 7.5.x version
• force version 7 in d/watch
• refresh patches
• add maven rule for picocli to use debian version of groovy-all.

Testing:

• build in ppa[1] for questing, noble, jammy and focal.

• tests against openjdk-21[2], openjdk-26[3]

  No new jtreg regressions in openjdk-21.

  com/sun/net/httpserver/simpleserver/DocRootDirPermissionsTest.java in openjdk-26 fails due to JDK-8166162, not related to jtreg upgrade.

[1] https://launchpad.net/~vpa1977/+archive/ubuntu/october-21

[2] https://launchpad.net/~vpa1977/+archive/ubuntu/october-21/+sourcepub/17488465/+listing-archive-extra

[3] https://launchpad.net/~vpa1977/+archive/ubuntu/october-21/+sourcepub/17487369/+listing-archive-extra

openjdk21.log openjdk26.log