help:effective-pom outputs wrong XML namespace when modelVersion is 4.1.0

### Affected version

3.5.1

### Bug description

using `pom.xml`
```

com.example
parent
1.0.0-SNAPSHOT
modelVersion = ${project.modelVersion}

```

with Maven 4.0.0-rc5 (and earlier in alpha):
```
$ mvn help:effective-pom
[INFO] Scanning for projects...
[INFO]
[INFO] --------------------------------------------------< com.example:parent >--------------------------------------------------
[INFO] Building parent 1.0.0-SNAPSHOT
[INFO] from pom.xml
[INFO] ---------------------------------------------------------[ jar ]----------------------------------------------------------
[INFO]
[INFO] --- help:3.5.1:effective-pom (default-cli) @ parent ---
[INFO]
Effective POMs, after inheritance, interpolation, and profiles are applied:

...

4.1.0
com.example
parent
1.0.0-SNAPSHOT
modelVersion = 4.1.0
```

should be:
```

```

Reproduce the issue with the supplied pom.xml and run mvn help:effective-pom using Maven 4.0.0-rc5. Trace the effective-POM XML generation and namespace selection; done means the output uses the Maven 4.1.0 namespace and matching schema location when modelVersion is 4.1.0.

Written by the indexing model from the issue text.