Fix some qt6 compile error

serializers/akonadi_serializer_addressee.cpp

@@ -12,6 +12,7 @@
 #include "serializer_debug.h"
 #include <KContacts/Addressee>
 #include <KLocalizedString>
+#include <QIODevice>
 
 using namespace Akonadi;
 

src/akonadi-contacts/attributes/contactmetadataattribute.cpp

@@ -9,6 +9,7 @@
 #include "contactmetadataattribute_p.h"
 
 #include <QDataStream>
+#include <QIODevice>
 
 using namespace Akonadi;
 

src/akonadi-contacts/grantlee/grantleecontactformatter.cpp

@@ -104,7 +104,7 @@ public:
     std::unique_ptr<KTextTemplate::Engine> mEngine;
     QSharedPointer<KTextTemplate::FileSystemTemplateLoader> mTemplateLoader;
     KTextTemplate::Template mSelfcontainedTemplate;
-    v::Template mEmbeddableTemplate;
+    KTextTemplate::Template mEmbeddableTemplate;
 #endif
     QString mErrorMessage;
     bool forceDisableQRCode = false;

src/akonadi-contacts/grantlee/grantleeprint.cpp

@@ -53,7 +53,11 @@ GrantleePrint::~GrantleePrint() = default;
 
 void GrantleePrint::init()
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     Grantlee::registerMetaType<QUrl>();
+#else
+    KTextTemplate::registerMetaType<QUrl>();
+#endif
 }
 
 QString GrantleePrint::contactsToHtml(const KContacts::Addressee::List &contacts)

src/contact-editor/customfields_p.h

@@ -12,8 +12,12 @@
 #include <QString>
 #include <QVariant>
 #include <QVector>
-
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 template<typename T> class QVector;
+#else
+template<typename T>
+class QList;
+#endif
 
 /**
  * @short A class that represents non-standard contact fields.