test-org-clock: Avoid daylight saving time failure

* testing/lisp/test-org-clock.el (test-org-clock/clocktable/match):
Shift times away from the beginning of the day to avoid unexpected
time totals due to DST changes.

test-org-clock/clocktable/match fails today in the US because at 2:00
clocks jumped to 3:00, and the total time check uses the range
2:00-4:00.

testing/lisp/test-org-clock.el

@@ -357,9 +357,9 @@ the buffer."
 |--------------+--------+------|
 | H1           |        | 2:00 |"
     (org-test-with-temp-text "** H1\n\n*** H2 :tag:\n\n*** H3\n<point>"
-      (insert (org-test-clock-create-clock ". 1:00" ". 2:00"))
+      (insert (org-test-clock-create-clock ". 8:00" ". 9:00"))
       (goto-line 4)
-      (insert (org-test-clock-create-clock ". 2:00" ". 4:00"))
+      (insert (org-test-clock-create-clock ". 9:00" ". 11:00"))
       (test-org-clock-clocktable-contents ":match \"tag\" :indent nil")))))
 
 (ert-deftest test-org-clock/clocktable/tags ()