ci: Don't print lsan suppressions

Printing these out breaks TAP output, and we really
aren't interested in them.

.gitlab-ci/run-tests.sh

@@ -8,7 +8,7 @@ builddir=$1
 backend=$2
 
 # Ignore memory leaks lower in dependencies
-export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp
+export LSAN_OPTIONS=suppressions=$srcdir/lsan.supp:print_suppressions=0
 export G_SLICE=always-malloc
 
 case "${backend}" in