phosphor-mapper.bb: bump version

Change-Id: I010274143cc7d40776afb6e077c3c92a00fd3176
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/common/recipes-phosphor/dbus/phosphor-mapper.bb b/common/recipes-phosphor/dbus/phosphor-mapper.bb
index 54c8833..cdb1159 100644
--- a/common/recipes-phosphor/dbus/phosphor-mapper.bb
+++ b/common/recipes-phosphor/dbus/phosphor-mapper.bb
@@ -23,7 +23,7 @@
         "
 SRC_URI += "git://github.com/openbmc/phosphor-objmgr"
 
-SRCREV = "a5513ab64dec439fc7a7f7114434ce04324cd5bd"
+SRCREV = "3c18b9f186d0894df83f34021553f72a9d9f0a8b"
 
 S = "${WORKDIR}/git"