[debuginfo-tests] Update Python variable in lit.site.cfg.py

GitOrigin-RevId: 7f84b6c1ba7d3b8eabc9af406f9f7f430b057935
diff --git a/lit.site.cfg.py.in b/lit.site.cfg.py.in
index a07842a..d5893f5 100644
--- a/lit.site.cfg.py.in
+++ b/lit.site.cfg.py.in
@@ -22,7 +22,7 @@
 
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 
-config.python3_executable = "@PYTHON_EXECUTABLE@"
+config.python3_executable = "@Python3_EXECUTABLE@"
 
 # Support substitution of the tools_dir with user parameters. This is
 # used when we can't determine the tool dir at configuration time.