Update pin for libsystemd

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update the pin for libsystemd. The current pinned version is 257, the latest available version is 259 and the max pin pattern is x. This migration will impact 4 feedstocks.

Checklist:

• The new version is a stable supported pin.
• I checked that the ABI changed from 257 to 259.

**Please note that if you close this PR we presume that the new pin has been rejected.

@conda-forge-admin please ping systemd

_{This PR was generated by https://github.com/regro/cf-scripts/actions/runs/21878415945 - please use this URL for debugging.}

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-webservice.

I was asked to ping @conda-forge/systemd and so here I am doing that.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-recipe-manager. The recipe can only be automatically migrated to the new v1 format if it is parseable by conda-recipe-manager.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/21879041137. Examine the logs at this URL for more detail.}

[ryanvolz]

Can close this or set to draft, see discussion in #7941: we want to maintain the global pin at 257 for compatibility with stdlib 2.17, but the ABI is stable and anyone that can use a newer stdlib will be able to use these newer versions of libsystemd.