Update git submodules

* Update masakari-monitors from branch 'master'
  to 4e7c3245959b1a8f76282781fa37118eca3c96cd
  - add pyproject.toml to support pip 23.1

    pip 23.1 removed the "setup.py install" fallback for projects
    that do not have pyproject.toml and now uses a pyproject.toml
    which is vendored in pip.
    To address that, this change adds the minimal pyproject.toml
    to enable pbr to be properly used to build editable wheels.

    See https://pip.pypa.io/en/stable/news/#v23-1
    and https://github.com/pypa/pip/issues/8368 for more
    details on the removal of the fallback support.

    Co-Authored-By: Sean Mooney <work@seanmooney.info>
    Change-Id: I08e1ff67febd4cf518e8a8c75621224bbd816ab0
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

diff --git a/masakari-monitors b/masakari-monitors
index e8d891e31947ee08f5561d878bdd7dad5920086b..4e7c3245959b1a8f76282781fa37118eca3c96cd 160000 (submodule)
--- a/masakari-monitors
+++ b/masakari-monitors
@@ -1 +1 @@
-Subproject commit e8d891e31947ee08f5561d878bdd7dad5920086b
+Subproject commit 4e7c3245959b1a8f76282781fa37118eca3c96cd