Revert to Qt 6.5.3 for macOS builds

A user reported having severe performance issues on macOS Tahoe
with v3.8-DEV2601 not present when using v3.7-sp1
Besides 6.5.3 is LTS and 6.6.1 is deprecated, so lets play safe
until we can upgrade to 6.8.3

appveyor.yml

@@ -81,8 +81,8 @@ init:
       qmake --version
     else
       export OS_NAME=macos
-      # Setup QT 6.6
-      export QTDIR=$HOME/Qt/6.6/macos
+      # Setup QT 6.5
+      export QTDIR=$HOME/Qt/6.5/macos
       export PATH=$QTDIR/bin:$PATH
       qmake --version
       # Setup Xcode 15.2

src/Train/KurtInRide.cpp

@@ -160,7 +160,12 @@ void inride_BTDeviceInfoToSystemID(const QBluetoothDeviceInfo &devinfo, uint8_t
 
         quint128 be_uuid128 = uuid.toUInt128();
 
+// GC minimum Qt required for v3.8 is Qt6.5.3
+#if QT_VERSION < 0x060600
+        addr64 = *(uint64_t*)be_uuid128.data;
+#else
         addr64 = *(uint64_t*)&be_uuid128;
+#endif
     }
 
     uint8_t* paddr64 = (uint8_t*)&addr64;

src/src.pro

@@ -5,7 +5,7 @@
 #                                                                             #
 ###############################################################################
 
-!versionAtLeast(QT_VERSION, 6.6.1):error("Use at least Qt version 6.6.1")
+!versionAtLeast(QT_VERSION, 6.5.3):error("Use at least Qt version 6.5.3")
 
 ###==========================
 ### IMPORT USER CONFIGURATION