Use openjpeg v2.5.2 (#2783).

Tests suggest it is considerably faster:

* arrietty on Linux/AMD
  old: 03:35
  new: 03:58

* Sintel.2010.1080p.mkv on Linux/AMD
  old: 0:29:49
  new: 0:22:39

* TRAILER VERSIE 4.mov on Apple M1
  old: 6:22
  new: 5:15

* TRAILER VERSIE 4.mov on Windows/Intel
  old: 6:10
  new: 4:12

1 files changed, 1 insertions, 1 deletions

diff --git a/run/tests b/run/tests
index 4315e227f..6f43290c4 100755
--- a/run/tests
+++ b/run/tests
@@ -3,7 +3,7 @@
 # e.g. --run_tests=foo
 set -e
 
-PRIVATE_GIT="f4b0c41b263a17cf33edae7565f16bd21eb80b65"
+PRIVATE_GIT="5298360d6bbae434fb4625fda1cc9dd6be101df3"
 
 if [ "$1" == "--check" ]; then
 	shift 1