Fix pydevd_attach_to_process Windows build script to locate VC++ using vswhere.

Update pydevd_attach_to_process binaries.

Author: int19h

src/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_amd64.dll

@@ -1,4 +1,9 @@
-call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x86
+@set VSWHERE=%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe
+@echo Using vswhere at %VSWHERE%
+@for /f "usebackq tokens=*" %%i in (`"%VSWHERE%" -latest -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath`) do set VSDIR=%%i
+@echo Using Visual C++ at %VSDIR%
+                                 
+call "%VSDIR%\VC\Auxiliary\Build\vcvarsall.bat" x86
 
 cl -DUNICODE -D_UNICODE /EHsc /Zi /O1 /W3 /LD /MD /Qspectre attach.cpp /link /DEBUG /OPT:REF /OPT:ICF /GUARD:CF /out:attach_x86.dll
 copy attach_x86.dll ..\attach_x86.dll /Y
@@ -12,7 +17,8 @@ cl /EHsc /Zi /O1 /W3 /Qspectre inject_dll.cpp /link /DEBUG  /OPT:REF /OPT:ICF /G
 copy inject_dll_x86.exe ..\inject_dll_x86.exe /Y
 copy inject_dll_x86.pdb ..\inject_dll_x86.pdb /Y
 
-call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64
+call "%VSDIR%\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64
+
 cl -DUNICODE -D_UNICODE /EHsc /Zi /O1 /W3 /LD /MD /Qspectre attach.cpp /link /DEBUG /OPT:REF /OPT:ICF /GUARD:CF /out:attach_amd64.dll
 copy attach_amd64.dll ..\attach_amd64.dll /Y
 copy attach_amd64.pdb ..\attach_amd64.pdb /Y