clang-format: update latest spec and reformat

Copy the latest format file from the docs repository and apply.

Change-Id: Id513ba4699f994d5bc2a8480c4a0b2659e9480ce
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/dbus/dbusutil.hpp b/dbus/dbusutil.hpp
index 49ec859..ff606a4 100644
--- a/dbus/dbusutil.hpp
+++ b/dbus/dbusutil.hpp
@@ -14,15 +14,15 @@
 struct VariantToDoubleVisitor
 {
     template <typename T>
-    std::enable_if_t<std::is_arithmetic<T>::value, double>
-        operator()(const T& t) const
+    std::enable_if_t<std::is_arithmetic<T>::value, double> operator()(
+        const T& t) const
     {
         return static_cast<double>(t);
     }
 
     template <typename T>
-    std::enable_if_t<!std::is_arithmetic<T>::value, double>
-        operator()([[maybe_unused]] const T& t) const
+    std::enable_if_t<!std::is_arithmetic<T>::value, double> operator()(
+        [[maybe_unused]] const T& t) const
     {
         throw std::invalid_argument("Cannot translate type to double");
     }