tf-a-lts2.10-ci-gateway: Update TF_M_TESTS_GERRIT_REFSPEC

Use tf-m-tests revision which builds with the lts-v2.10 branch.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ib6d8a90d3213800115b15947764d6d1269d8bb10
1 file changed