Make Uuid's default constructor implicit (#6243)

Co-authored-by: Anton Kolesnyk <antkmsft@users.noreply.github.com>

sdk/core/azure-core/inc/azure/core/uuid.hpp

@@ -37,7 +37,7 @@ namespace Azure { namespace Core {
      */
     // Nil UUID, per RFC9562, consists of all zeros:
     // https://www.rfc-editor.org/rfc/rfc9562.html#name-nil-uuid
-    constexpr explicit Uuid() : m_uuid{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} {}
+    constexpr Uuid() : m_uuid{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} {}
 
     /**
      * @brief Gets Uuid as a string.