Port clijplugin from QStringRef

It's gone in Qt 6.

plugins/cliarjplugin/cliplugin.cpp

@@ -9,6 +9,7 @@
 
 #include <QDateTime>
 #include <QFileInfo>
+#include <QStringView>
 
 #include <KLocalizedString>
 #include <KPluginFactory>
@@ -246,17 +247,29 @@ bool CliPlugin::tryAddCurFileProperties(const QString &line)
         return false;
     }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     m_currentParsedFile->m_origSize = line.midRef(13, 10).toULongLong(&ok);
+#else
+    m_currentParsedFile->m_origSize = QStringView(line).mid(13, 10).toULongLong(&ok);
+#endif
     if (!ok) {
         return false;
     }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     m_currentParsedFile->m_compressedSize = line.midRef(24, 10).toULongLong(&ok);
+#else
+    m_currentParsedFile->m_compressedSize = QStringView(line).mid(24, 10).toULongLong(&ok);
+#endif
     if (!ok) {
         return false;
     }
 
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     m_currentParsedFile->m_ratio = line.midRef(35, 5).toDouble(&ok);
+#else
+    m_currentParsedFile->m_ratio = QStringView(line).mid(35, 5).toDouble(&ok);
+#endif
     if (!ok) {
         return false;
     }