Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 726720a07af9d81bef3b16059d18ecac9b8fd5aa
  - Merge "Remove all Functest K8S v1.24 and v1.25 jobs"
  - Remove all Functest K8S v1.24 and v1.25 jobs

    They are all now EOL
    https://kubernetes.io/releases/

    Change-Id: I3879250ea2573d8ff3c3194fba130ba0c52e9234
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e12b491..726720a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e12b491f953b9190b7cc7e05cdf742e260789b8f
+Subproject commit 726720a07af9d81bef3b16059d18ecac9b8fd5aa