Make test case numbers unique

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t2104-update-index-gitfile.sh b/t/t2105-update-index-gitfile.sh
similarity index 100%
rename from t/t2104-update-index-gitfile.sh
rename to t/t2105-update-index-gitfile.sh

diff --git a/t/t3415-rebase-onto-threedots.sh b/t/t3416-rebase-onto-threedots.sh
similarity index 100%
rename from t/t3415-rebase-onto-threedots.sh
rename to t/t3416-rebase-onto-threedots.sh