CTAN update: l3backend

The LaTeX Project Team submitted an update to the

                l3backend

package.

Version: 2025-06-09
License: lppl1.3c

Summary description: LaTeX3 backend drivers

Announcement text:
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## [2025-06-09]

### Changed
- Set PDF 1.7 as standard value for `(x)dvipdfmx`

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This package is located at
   https://mirrors.ctan.org/macros/latex/required/l3backend

More information is at
   https://ctan.org/pkg/l3backend


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   Thanks for the upload.

     For the CTAN Team
    Manfred Lotz


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