Bump sphinxcontrib-programoutput from 0.17 to 0.18 (spack#424)

Bumps [sphinxcontrib-programoutput](https://github.com/NextThought/sphinxcontrib-programoutput) from 0.17 to 0.18.
- [Changelog](https://github.com/OpenNTI/sphinxcontrib-programoutput/blob/master/CHANGES.rst)
- [Commits](OpenNTI/sphinxcontrib-programoutput@0.17...0.18)

---
updated-dependencies:
- dependency-name: sphinxcontrib-programoutput
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 # These dependencies should be installed using pip in order
 # to build the documentation.
 Sphinx==8.1.3
-sphinxcontrib-programoutput==0.17
+sphinxcontrib-programoutput==0.18
 sphinx-rtd-theme==3.0.2
 sphinx-copybutton==0.5.2
 python-levenshtein==0.26.1