fix intermittent test_ci_fuzz_stdlib failures

Author: chris-eibl

Lib/test/test_tools/test_compute_changes.py

@@ -54,6 +54,8 @@ def test_ci_fuzz_stdlib(self):
                         f = p / "file"
                     elif p.is_file():
                         f = p
+                    else:
+                        self.fail(f"LIBRARY_FUZZER_PATHS contains an invalid entry: {p!r}")
                     result = process_changed_files({f})
                     self.assertTrue(result.run_ci_fuzz_stdlib)
                     self.assertTrue(is_fuzzable_library_file(f))

Tools/build/compute-changes.py

@@ -90,7 +90,7 @@
     # tarfile
     Path("Lib/tarfile.py"),
     # tomllib
-    Path("Modules/tomllib/"),
+    Path("Lib/tomllib/"),
     # xml
     Path("Lib/xml/"),
     Path("Lib/_markupbase.py"),