Enable testing of merge-queues

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
Change-Id: Ibf834021556b2dd3561caff47474446ee37aa3d5
diff --git a/mbed-tls-pr-head.yaml b/mbed-tls-pr-head.yaml
index 3eba5a9..1af2dd7 100644
--- a/mbed-tls-pr-head.yaml
+++ b/mbed-tls-pr-head.yaml
@@ -38,7 +38,7 @@
         discover-pr-forks-strategy: both
         discover-pr-forks-trust: permission
         discover-pr-origin: both
-        head-filter-regex: '(?!^PR-(1824)-(merge|head)$)(PR-\d+-head)'
+        head-filter-regex: '(?!^PR-(7958|7959)-(head)$)(PR-\d+-head)'
         property-strategies:
           all-branches:
           - pipeline-branch-durability-override: performance-optimized