tf-a-eclair-delta: Decrease artifact-num-to-keep

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I7a5c55bd097a0f6975c5a23d05f4e29ae1155bfc
diff --git a/tf-a-eclair-delta.yaml b/tf-a-eclair-delta.yaml
index f1eb01e..61b6004 100644
--- a/tf-a-eclair-delta.yaml
+++ b/tf-a-eclair-delta.yaml
@@ -10,7 +10,7 @@
         - build-discarder:
             days-to-keep: 45
             num-to-keep: 200
-            artifact-num-to-keep: 100
+            artifact-num-to-keep: 80
         - authorization:
             !include: authorization.yaml.inc
         - throttle: