CI: remove redundant interruptiple assignment

Change-Id: I2e95cb1bf88cf77a59b54cb529dad4d471b6eb06
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -28,7 +28,6 @@ stages:
 # Generalised fragment to do a Kas build
 .build:
   extends: .setup
-  interruptible: true
   script:
     - KASFILES=$(./ci/jobs-to-kas $CI_JOB_NAME)
     - kas shell --update --force-checkout $KASFILES -c 'cat conf/*.conf'