update virtual clock in miri test since signed loops now execute more methods

the8472 · the8472 · commit d3cab9f4d6c7 · 2024-03-14T00:57:59.000+01:00
diff --git a/src/tools/miri/tests/pass/shims/time-with-isolation2.stdout b/src/tools/miri/tests/pass/shims/time-with-isolation2.stdout
@@ -1 +1 @@
-The loop took around 7s
+The loop took around 12s
