Updates timing of triggers automated jobs

Aligns the timing better to UK time rather than the previous time zone
it was designed for.

Change-Id: I53e87f66c5b5ef8e2ebdb84b14df54c25e0dc11d
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
diff --git a/tf-m-nightly.yaml b/tf-m-nightly.yaml
index 1a513c4..5ec80cd 100644
--- a/tf-m-nightly.yaml
+++ b/tf-m-nightly.yaml
@@ -17,7 +17,7 @@
           days-to-keep: 15
           num-to-keep: 45
     triggers:
-      - timed: 'H 16 * * *'
+      - timed: 'H 23 * * *'
     parameters:
       - string:
           name: 'FILTER_GROUP'