Fix Test Breakage on WSL (#8263)

`tools/clang/test/DXC/highlight-range-null-byte.test` was failing on WSL
due to `python` not being on the path.

Replace the command with an equivalent call to `printf`

Author: V-FEXrt

tools/clang/test/DXC/highlight-range-null-byte.test

@@ -1,7 +1,7 @@
 // Regression test: dxc crashes on HLSL with embedded null bytes due to
 // out-of-bounds access in highlightRange() (TextDiagnostic.cpp).
 
-// RUN: python -c "import sys; sys.stdout.buffer.write(b'f(){a b int4\x00(1}')" > %t.hlsl
+// RUN: printf 'f(){a b int4\0(1}' > %t.hlsl
 // RUN: not %dxc /T ps_6_0 %t.hlsl 2>&1 | FileCheck %s
 
 // CHECK: error: HLSL requires a type specifier for all declarations