Missing Attribute for PBXFileSystemSynchronizedRootGroup

Hi,

getting these errors on my project:
```
[!] Xcodeproj doesn't know about the following attributes {"name" => "Common"} for the 'PBXFileSystemSynchronizedRootGroup' isa.
▸ If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new
▸ [!] Xcodeproj doesn't know about the following attributes {"name" => "Services"} for the 'PBXFileSystemSynchronizedRootGroup' isa.
▸ If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new
```

Xcode 26, Project File Format 16.0. Likely https://github.com/CocoaPods/Xcodeproj/pull/985 is missing the name attribute or it was introduced later.

hth!

Start by locating the PBXFileSystemSynchronizedRootGroup handling and reviewing pull request #985, which the issue identifies as related. Reproduce the warning with the reported Xcode 26, Project File Format 16.0 input; done means the name attribute is recognized without the reported warning.

Written by the indexing model from the issue text.