Update sphinxcontrib-bibtex requirement from ~=2.3.0 to >=2.3,<2.6

Updates the requirements on [sphinxcontrib-bibtex](https://github.com/mcmtroffaes/sphinxcontrib-bibtex) to permit the latest version.
- [Release notes](https://github.com/mcmtroffaes/sphinxcontrib-bibtex/releases)
- [Changelog](https://github.com/mcmtroffaes/sphinxcontrib-bibtex/blob/develop/CHANGELOG.rst)
- [Commits](mcmtroffaes/sphinxcontrib-bibtex@2.3.0...2.5.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-bibtex
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

setup.cfg

@@ -60,7 +60,7 @@ doc =
     m2r2~=0.3.1
     pydata-sphinx-theme>=0.7.2,<0.9.0
     sphinx-panels~=0.6.0
-    sphinxcontrib-bibtex~=2.3.0
+    sphinxcontrib-bibtex>=2.3,<2.6
     pandoc>=2.0.1,<2.2.0
     nbsphinx~=0.8.7
     nbsphinx-link~=1.3.0