Update git submodules

* Update docs/submodules/promise from branch 'stable/euphrates'
  - Updated from global requirements

    Change-Id: Iacd1136acb604f599a48b50a0c0964c36061ecb3
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/promise b/docs/submodules/promise
index 889d321..33c9f0e 160000 (submodule)
--- a/docs/submodules/promise
+++ b/docs/submodules/promise
@@ -1 +1 @@
-Subproject commit 889d321b6cf404d9c500ad584f975c01b14460fb
+Subproject commit 33c9f0efcc7c429eacbe28a8a49099b0d592d212