Update spiner submodule, for new Databox::interpToReal overload.

[RyanWollaeger]

PR Summary

• A dependent code consumes spiner through singularity-eos and singularity-opac.
• The change in the spiner submodule should not currently affect anything singularity-eos, but is needed indirectly from the dependent code (it needs to be consistent with the submodule in singularity-opac).

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the make format command after configuring with cmake.
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• After creating a pull request, note it in the CHANGELOG.md file.
• LANL employees: make sure tests pass both on the github CI and on the Darwin CI

If preparing for a new release, in addition please check the following:

• Update the version in cmake.
• Move the changes in the CHANGELOG.md file under a new header for the new release, and reset the categories.
• Ensure that any when='@main' dependencies are updated to the release version in the package.py

[RyanWollaeger]

@Yurlungur - sorry for the cross-repo spiner submodule update - this should be the last one to get things working in a pending jaybenne change set.