Update git submodules

* Update releases from branch 'master'
  to 51ca1cf9dac1282aeb63fdb94baaa05a4a76086a
  - Merge "Move unmaintained/wallaby to EOL"
  - Move unmaintained/wallaby to EOL

    As announced on mailing list [1], this patch moves unmaintained/wallaby
    to End of Life.

    [1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/thread/N24CYAJMLVJMAJMUE4RA5U7KOL7LABOW/

    Change-Id: I0183d0d89ff58fcc7718fa604d2722aca1c70285
    Signed-off-by: Előd Illés <elod.illes@est.tech>

diff --git a/releases b/releases
index 51a6b59706eb902eef38d81a1b126d43440d7318..51ca1cf9dac1282aeb63fdb94baaa05a4a76086a 160000 (submodule)
--- a/releases
+++ b/releases
@@ -1 +1 @@
-Subproject commit 51a6b59706eb902eef38d81a1b126d43440d7318
+Subproject commit 51ca1cf9dac1282aeb63fdb94baaa05a4a76086a