tests: Increase timeout value to 360 sec

Use consistent timeout value with core and other plugins.
Otherwise, valgrind sometimes timed out with default timeout 30sec.

tests/check/meson.build

@@ -65,7 +65,7 @@ foreach t : ges_tests
         include_directories : [configinc],
         dependencies : libges_deps + [gstcheck_dep, ges_dep],
     )
-    test(test_name, exe, env: env)
+    test(test_name, exe, env: env, timeout : 3 * 60)
   endif
 endforeach