pid/builder: switch to structured bindings

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I770117d595fb2dbaa6c6d36b688e215be4ba5d45
diff --git a/pid/zone.cpp b/pid/zone.cpp
index 9621993..7f4a903 100644
--- a/pid/zone.cpp
+++ b/pid/zone.cpp
@@ -347,9 +347,9 @@
 void DbusPidZone::dumpCache(void)
 {
     std::cerr << "Cache values now: \n";
-    for (const auto& k : _cachedValuesByName)
+    for (const auto& [name, value] : _cachedValuesByName)
     {
-        std::cerr << k.first << ": " << k.second << "\n";
+        std::cerr << name << ": " << value << "\n";
     }
 }