Rebuild for spdlog 1.15

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update spdlog115.

Notes and instructions for merging this PR:

1. Please merge the PR only after the tests have passed.
2. Feel free to push to the bot's branch to update this PR if needed.

Please note that if you close this PR we presume that the feedstock has been rebuilt, so if you are going to perform the rebuild yourself don't close this PR until the your rebuild has been merged.

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If this PR was opened in error or needs to be updated please add the bot-rerun label to this PR. The bot will close this PR and schedule another one. If you do not have permissions to add this label, you can use the phrase @conda-forge-admin, please rerun bot in a PR comment to have the conda-forge-admin add it for you.

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[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 use of xz is deprecated. If your package links to liblzma, use the new liblzma-devel package. For XZ's command line utilities (like xz and unxz), use the xz-toolspackage. For the xz-enabled GNU tools (like grep), use xz-gpl-tools. Note: Command line utilities should go in requirements/build.
• ℹ️ The recipe is not parsable by parser conda-forge-tick (the bot). Your recipe may not receive automatic updates and/or may not be compatible with conda-forge's infrastructure. Please check the logs for more information and ensure your recipe can be parsed.
• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/12668788704. Examine the logs at this URL for more detail.}

[minrk]

I'm not sure it's possible to get a valid environment until conda-forge/conda-forge-repodata-patches-feedstock#936 is addressed

[regro-cf-autotick-bot]

Due to the bot-rerun label I'm closing this PR. I will make another PR as appropriate. You should expect to wait at least a few hours, or possibly much longer, for a new PR.

_{This message was generated by https://github.com/regro/cf-scripts/actions/runs/12806479785 - please use this URL for debugging.}