cli: tweak check for when to use module register API

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/poor-pandas-dream.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Tweaked Node.js version check for when to use the new module register API with the new backend `package start` command.

packages/cli/src/lib/experimental/startBackendExperimental.ts

@@ -28,7 +28,8 @@ import { paths } from '../paths';
 import spawn from 'cross-spawn';
 
 const [nodeMajor, nodeMinor] = process.versions.node.split('.').map(Number);
-const supportsModuleLoaderRegister = nodeMajor >= 20 && nodeMinor >= 6;
+const supportsModuleLoaderRegister =
+  nodeMajor > 20 || (nodeMajor === 20 && nodeMinor >= 6);
 
 const loaderArgs = [
   '--require',