tests/unit: Bump test-crypto-block test timeout to 5 minutes

When running the tests in slow mode on a very loaded system and with
--enable-debug, the test-crypto-block can take longer than 4 minutes.
Bump the timeout to 5 minutes to make sure that it also passes in
such situations.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20231215070357.10888-15-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
diff --git a/tests/unit/meson.build b/tests/unit/meson.build
index 937e1eb..0659532 100644
--- a/tests/unit/meson.build
+++ b/tests/unit/meson.build
@@ -173,6 +173,7 @@
 
 slow_tests = {
   'test-aio-multithread' : 120,
+  'test-crypto-block' : 300,
   'test-crypto-tlscredsx509': 45,
   'test-crypto-tlssession': 45
 }