Update git submodules

* Update vendor from branch 'REL1_34'
  to 4e1e1ae5f6f484aaa2713f7c9d60bd2887964fbf
  - Bump required PHP >= 7.2.9 to match core

    Change-Id: Ib0ec551c99530f5481b8c9b885b05743816253e8

diff --git a/vendor b/vendor
index b25f294..4e1e1ae 160000 (submodule)
--- a/vendor
+++ b/vendor
@@ -1 +1 @@
-Subproject commit b25f2949a29d059df14ace2c385ac43b683ce828
+Subproject commit 4e1e1ae5f6f484aaa2713f7c9d60bd2887964fbf