Update git submodules

* Update swift from branch 'master'
  to 3a4da50dec23d0b069fc50dc83472c73c31eebf5
  - Merge "Replace deprecated warn method"
  - Replace deprecated warn method

    The warn method of logger instances has been deprecated. Use warning
    instead.

    Change-Id: I6f5e612077e5044930b80aa5404b778326e3f14f
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

diff --git a/swift b/swift
index 0323f9c2ddb5e9ccb12c44ed2a82fd3ef3ea0bf8..3a4da50dec23d0b069fc50dc83472c73c31eebf5 160000 (submodule)
--- a/swift
+++ b/swift
@@ -1 +1 @@
-Subproject commit 0323f9c2ddb5e9ccb12c44ed2a82fd3ef3ea0bf8
+Subproject commit 3a4da50dec23d0b069fc50dc83472c73c31eebf5