[code-health] Fix remaining flake8 issue in v8

Bug: v8:8594
Change-Id: I398678bb92105dc99882e4a253d0c6235628952f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3892178
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Fabrice de Gans <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83146}

tools/dev/update-compile-commands.py

@@ -52,7 +52,7 @@ def PrepareBuildDir(arch, mode):
   build_ninja = os.path.join(build_dir, "build.ninja")
   if not os.path.exists(build_ninja):
     code = _Call("gn gen %s" % build_dir)
-    if code != 0: raise Error("gn gen failed")
+    if code != 0: raise Exception("gn gen failed")
   else:
     _Call("ninja -C %s build.ninja" % build_dir)
   return build_dir