Build: Bump tf-m-tests

Follow up on renaming TRNG to random in BL1-1 tests

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: Ib2d8f37410b687d3ca573dbd981f339cb3a8212e
diff --git a/lib/ext/tf-m-tests/version.txt b/lib/ext/tf-m-tests/version.txt
index b202d92..0ef342f 100644
--- a/lib/ext/tf-m-tests/version.txt
+++ b/lib/ext/tf-m-tests/version.txt
@@ -9,4 +9,4 @@
 # current TF-M version.
 # TF-M does not rely on this file to build.
 
-version=911ffcdab
+version=3e440b669