RFR: 7904048: Update jtreg to use Ant 1.10.15 [v3]

[Christian Stein]

> Please review this update to make jtreg use Ant 1.10.15

Christian Stein has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year
  
  [skip ci]

-------------

Changes:
  - all: https://git.openjdk.org/jtreg/pull/270/files
  - new: https://git.openjdk.org/jtreg/pull/270/files/07168bd3..ba38bd85

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jtreg&pr=270&range=02
 - incr: https://webrevs.openjdk.org/?repo=jtreg&pr=270&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jtreg/pull/270.diff
  Fetch: git fetch https://git.openjdk.org/jtreg.git pull/270/head:pull/270

PR: https://git.openjdk.org/jtreg/pull/270