tests/unit: Bump test-replication timeout to 60 seconds

We're seeing timeouts for this test on CI runs (specifically for
ubuntu-20.04-s390x-all). It doesn't fail consistently, but even the
successful runs take about 27 or 28 seconds, which is not very far from
the 30 seconds timeout.

Bump the timeout a bit to make failure less likely even on this CI host.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20240125165803.48373-1-kwolf@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/unit/meson.build

@@ -175,7 +175,8 @@ slow_tests = {
   'test-aio-multithread' : 120,
   'test-crypto-block' : 300,
   'test-crypto-tlscredsx509': 45,
-  'test-crypto-tlssession': 45
+  'test-crypto-tlssession': 45,
+  'test-replication': 60,
 }
 
 foreach test_name, extra: tests