clang-tidy: Apply modernize-deprecated-headers

This can be reproduced according to the developer notes with something
like

( cd ./src/ && ../contrib/devtools/run-clang-tidy.py -p ../bld-cmake -fix -j $(nproc) )

Also, the header related changes were done manually.

src/qt/bitcoin.h

@@ -10,7 +10,7 @@
 #include <interfaces/node.h>
 #include <qt/initexecutor.h>
 
-#include <assert.h>
+#include <cassert>
 #include <memory>
 #include <optional>
 

src/qt/clientmodel.cpp

@@ -23,7 +23,7 @@
 #include <util/time.h>
 #include <validation.h>
 
-#include <stdint.h>
+#include <cstdint>
 
 #include <QDebug>
 #include <QMetaObject>

src/qt/notificator.cpp

@@ -18,7 +18,7 @@
 #ifdef USE_DBUS
 #include <QDBusMetaType>
 #include <QtDBus>
-#include <stdint.h>
+#include <cstdint>
 #endif
 #ifdef Q_OS_MACOS
 #include <qt/macnotificationhandler.h>

src/qt/optionsmodel.h

@@ -12,7 +12,7 @@
 #include <QAbstractListModel>
 #include <QFont>
 
-#include <assert.h>
+#include <cassert>
 #include <variant>
 
 struct bilingual_str;

src/qt/transactiondesc.cpp

@@ -19,7 +19,7 @@
 #include <validation.h>
 #include <wallet/types.h>
 
-#include <stdint.h>
+#include <cstdint>
 #include <string>
 
 #include <QLatin1String>

src/qt/transactionrecord.cpp

@@ -9,7 +9,7 @@
 #include <key_io.h>
 #include <wallet/types.h>
 
-#include <stdint.h>
+#include <cstdint>
 
 #include <QDateTime>