[PATCH] Make test number t7406- unique

From: Johannes Sixt <redacted>

We skip t7407 because a patch series is cooking that uses is.

Signed-off-by: Johannes Sixt <redacted>
---
 ...e-reference.sh => t7408-submodule-reference.sh} |    0
 1 files changed, 0 insertions(+), 0 deletions(-)
 rename t/{t7406-submodule-reference.sh => t7408-submodule-reference.sh} (100%)

diff --git a/t/t7406-submodule-reference.sh b/t/t7408-submodule-reference.sh
similarity index 100%
rename from t/t7406-submodule-reference.sh
rename to t/t7408-submodule-reference.sh
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1.6.4.204.g6aad7