Bump sphinxcontrib-bibtex from 2.6.3 to 2.6.4 in the sphinx group

[dependabot]

Bumps the sphinx group with 1 update: sphinxcontrib-bibtex.

Updates sphinxcontrib-bibtex from 2.6.3 to 2.6.4

Changelog

Sourced from sphinxcontrib-bibtex's changelog.

2.6.4 (17 June 2025)

• Add Python 3.13 support.

• Add setuptools as dependency on all Python versions. This fixes an issue with an undeclared setuptools dependency in the latest release of pybtex. See discussion in issue #345.

• Python 3.7 and 3.8 are EOL and are therefore no longer officially supported.

• FootCiteRole now derives from SphinxRole instead of XRefRole, simplifying the implementation.

• Bib files in conf.py are now resolved relative to confdir instead of srcdir (reported and fixed by rgambord, see issue #357 and pull request #358).

• Duplicate label warnings are no longer issued if the non-prefixed keys are identical. This allows having duplicate citations, as long as the keys are differently prefixed, which is a common use case. See issue #365 reported by ego-thales.

Commits

• b59659e Prepare release 2.6.4 (#371)
• 642353e Document how to remove backrefs with whitespace (closes #364 again) (#368)
• a455b0e Fix doc reference. [skip ci]
• e543128 Doc fixes. [skip ci]
• d18485e Fix. [skip ci]
• 7c176ad Document how to remove backrefs (closes #364).
• 60e6038 Update docs since label prefix no longer needed for duplicate citations if ke...
• ae01c53 Only complain about duplicate labels when the non-prefixed keys are different...
• 6359d5b Add test for absolute paths. (#363)
• b8983b5 Consistently use pathlib for bibfiles.
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore <dependency name> major version will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself)
• @dependabot ignore <dependency name> minor version will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself)
• @dependabot ignore <dependency name> will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself)
• @dependabot unignore <dependency name> will remove all of the ignore conditions of the specified dependency
• @dependabot unignore <dependency name> <ignore condition> will remove the ignore condition of the specified dependency and ignore conditions