Update Snapshot builds

Embedded Python (3.11) and SIP (6.15.1) upgrade
with updated modules: numpy, pandas, plotly, etc.
[publish binaries]

src/Core/GcUpgrade.h

@@ -127,7 +127,7 @@
 #define VERSION36_BUILD   5000 // released 5/8/23
 #define VERSION37_BUILD   5005 // released 28/3/25
 #define VERSION37_SP1     5006 // released 20/11/25
-#define VERSION38_DEV2601 5010 // (Jan 2026) - latest snapshot 24/1/26
+#define VERSION38_DEV2601 5010 // (Jan 2026) - latest snapshot 29/1/26
 
 // will keep changing during testing and before final release
 #define VERSION31_BUILD VERSION31_UPG

src/Resources/win32/GC3.8-Master-W64-QT6.nsi

@@ -385,9 +385,9 @@ Section Uninstall
   Delete "$INSTDIR\_multiprocessing.pyd"
   Delete "$INSTDIR\_overlapped.pyd"
   Delete "$INSTDIR\pyexpat.pyd"
-  Delete "$INSTDIR\python37.dll"
-  Delete "$INSTDIR\python37._pth"
-  Delete "$INSTDIR\python37.zip"
+  Delete "$INSTDIR\python311.dll"
+  Delete "$INSTDIR\python311._pth"
+  Delete "$INSTDIR\python311.zip"
   Delete "$INSTDIR\python3.dll"
   Delete "$INSTDIR\python.exe"
   Delete "$INSTDIR\pythonw.exe"