sdbusplus: avoid deprecated phosphor::Timer

sdbusplus had an older type named `phosphor::Timer` which was
recently renamed to `sdbusplus::Timer`.  Update the code to use
the new type alias.

Change-Id: I68d3968bcb359bee5ea0c9e695572b68fcf34136
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/requester/test/request_test.cpp b/requester/test/request_test.cpp
index 51b337d..25d2c32 100644
--- a/requester/test/request_test.cpp
+++ b/requester/test/request_test.cpp
@@ -88,7 +88,7 @@
     EXPECT_EQ(rc, PLDM_SUCCESS);
 
     auto requestStopCallback = [&](void) { request.stop(); };
-    phosphor::Timer timer(event.get(), requestStopCallback);
+    sdbusplus::Timer timer(event.get(), requestStopCallback);
     timer.start(duration_cast<microseconds>(seconds(1)));
 
     waitEventExpiry(milliseconds(500));