fixup! test_runner: fix --test-rerun-failures swallowing failures on retry

Author: atlowChemi

test/parallel/test-runner-test-rerun-failures.js

@@ -170,7 +170,8 @@ test('failing test is not swallowed when siblings share its source location', as
   const fixturePath = fixtures.path('test-runner', 'rerun-shared-helper-swallows-failure.mjs');
   const args = ['--test-rerun-failures', stateFile, fixturePath];
 
-  const fixtureKey = relative(process.cwd(), fixturePath);
+  // getStateFile() normalises backslashes to '/'; match that on Windows.
+  const fixtureKey = relative(process.cwd(), fixturePath).replaceAll('\\', '/');
   const innerLoc = `${fixtureKey}:25:13`;
   const passingInner = { passed_on_attempt: 0, name: 'inner' };
   const expectedInnerSlots = {