Also reset file modification times of individual zips before zipping all

Otherwise the final zip will not be deterministic
3 jobs for master in 28 minutes and 52 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #1308
build

00:01:46

 
  Test
passed #1309
test

00:26:29

 
  Release
passed #1310
release

00:00:36