modules: use 'fromSecsSinceEpoch' instead of 'fromTime_t'

Required for Qt 6, and 'fromTime_t' has become obsolete already
during Qt 5 times.

- https://code.qt.io/cgit/qt/qtbase.git/commit/?id=8c8eae279d5

Picked from: #1770

Author: Chiitoo

src/modules/importers/opera/OperaBookmarksImportDataExchanger.cpp

@@ -285,11 +285,11 @@ void OperaBookmarksImportJob::start()
 			}
 			else if (line.startsWith(QLatin1String("\tCREATED=")))
 			{
-				bookmark->setData(QDateTime::fromTime_t(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeAddedRole);
+				bookmark->setData(QDateTime::fromSecsSinceEpoch(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeAddedRole);
 			}
 			else if (line.startsWith(QLatin1String("\tVISITED=")))
 			{
-				bookmark->setData(QDateTime::fromTime_t(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeVisitedRole);
+				bookmark->setData(QDateTime::fromSecsSinceEpoch(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeVisitedRole);
 			}
 		}
 	}

src/modules/importers/opera/OperaNotesImportDataExchanger.cpp

@@ -243,7 +243,7 @@ bool OperaNotesImportDataExchanger::importData(const QString &path)
 			}
 			else if (line.startsWith(QLatin1String("\tCREATED=")))
 			{
-				note->setData(QDateTime::fromTime_t(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeAddedRole);
+				note->setData(QDateTime::fromSecsSinceEpoch(line.section(QLatin1Char('='), 1, -1).toUInt()), BookmarksModel::TimeAddedRole);
 			}
 		}
 	}