test: fix PendingValues verif

certora/specs/PendingValues.spec

@@ -15,16 +15,20 @@ invariant noBadPendingTimelock()
         requireInvariant timelockInRange();
         // Safe require as it corresponds to some time very far into the future.
         require e.block.timestamp < 2^63;
+        // Safe require as it corresponds to some time very far into the past.
+        require e.block.timestamp > 0;
     }
 }
 
 // Check that the pending timelock value is always strictly smaller than the current timelock value.
 invariant smallerPendingTimelock()
     assert_uint256(pendingTimelock_().value) < timelock()
 {
-    preserved {
+    preserved with (env e) {
         requireInvariant pendingTimelockInRange();
         requireInvariant timelockInRange();
+        // Safe require as it corresponds to some time very far into the past.
+        require e.block.timestamp > 0;
     }
 }
 
@@ -73,6 +77,8 @@ invariant noBadPendingGuardian()
         requireInvariant timelockInRange();
         // Safe require as it corresponds to some time very far into the future.
         require e.block.timestamp < 2^63;
+        // Safe require as it corresponds to some time very far into the past.
+        require e.block.timestamp > 0;
     }
 }