t9001: use a more distinct fake BugID

In the test "cc list is sanitized", we feed a commit with a variety of
trailers to send-email, and then check its output to see how it handled
them. For most of them, we are grepping for a specific mention of the
header, but there's a "BugID" header which we expect to be ignored. We
confirm this by grepping for "12345", the fake BugID, and making sure it
is not present.

But we can be fooled by false positives! I just tracked down a flaky
test failure here that was caused by matching this unrelated line in the
output:

  <20240914090449.612345-1-author@example.com>

which will change from run to run based on the time, pid, etc.

Ideally we'd tighten the regex to make this more specifically, but since
the point is that it _shouldn't_ be mentioned, it's hard to say what the
right match would be (e.g., would there be a leading space?).

Instead, let's just choose a match that is much less likely to appear.
The actual content of the header isn't important, since it's supposed to
be ignored.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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