plugin: add 0BSD as valid license

Add the zero-clause BSD license, which is an alteration of the ISC
license, to the list of valid licenses.
9 jobs for plugin-licenses in 31 minutes and 31 seconds (queued for 2 minutes and 57 seconds)
Status Job ID Name Coverage
  Preparation
passed #137464
gst indent

00:00:33

passed #137463
manifest

00:00:24

 
  Build
passed #137465
build fedora x86_64

00:04:37

 
  Test
passed #137466
check fedora

00:03:54

 
  Full Builds
passed #137467
build android arm64 api28

00:03:49

passed #137469
build cerbero cross win32

00:07:04

passed #137699
build cerbero cross win64

00:04:51

passed #137468
build cerbero fedora x86_64

00:06:15

failed #137470
build cerbero cross win64

00:00:52