pyphosphor.bb: bump version

Change-Id: I56b1eeef8e943868ae39cf54c060701d5fb8caa1
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/common/recipes-devtools/python/pyphosphor.bb b/common/recipes-devtools/python/pyphosphor.bb
index 542c2cf..d80d357 100644
--- a/common/recipes-devtools/python/pyphosphor.bb
+++ b/common/recipes-devtools/python/pyphosphor.bb
@@ -49,6 +49,6 @@
 
 SRC_URI += "git://github.com/openbmc/pyphosphor"
 
-SRCREV = "7a57f95bb8b44d008748307446c1b11757c1ae70"
+SRCREV = "857e4b834f4bcece8d1006a1fbaef7c2847681d4"
 
 S = "${WORKDIR}/git"