Adjust the schedule for nightly merge jobs

This way we match the behaviour of the Internal CI.

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: I0d8e01796e48ca206b0d4c48c8023291f70e70da
diff --git a/mbedtls-repo-scan-scheduler.yaml b/mbedtls-repo-scan-scheduler.yaml
index 06121f7..b201215 100644
--- a/mbedtls-repo-scan-scheduler.yaml
+++ b/mbedtls-repo-scan-scheduler.yaml
@@ -12,7 +12,7 @@
     project-type: pipeline
     sandbox: true
     triggers:
-    - timed: 0 6 * * *
+    - timed: 0 21 * * *
     properties:
     - build-blocker:
         block-level: GLOBAL