Bump sphinxcontrib-bibtex from 2.6.3 to 2.6.4 in /docs/sphinx (#2365)

Bumps [sphinxcontrib-bibtex](https://github.com/mcmtroffaes/sphinxcontrib-bibtex) from 2.6.3 to 2.6.4.
- [Changelog](https://github.com/mcmtroffaes/sphinxcontrib-bibtex/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/mcmtroffaes/sphinxcontrib-bibtex/compare/2.6.3...2.6.4)

---
updated-dependencies:
- dependency-name: sphinxcontrib-bibtex
  dependency-version: 2.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

[ROCm/composable_kernel commit: c8b247c55c]

docs/sphinx/requirements.in

@@ -1,2 +1,2 @@
 rocm-docs-core[api_reference]==1.20.1
-sphinxcontrib-bibtex==2.6.3
+sphinxcontrib-bibtex==2.6.4

docs/sphinx/requirements.txt

@@ -278,7 +278,7 @@ sphinx-notfound-page==1.1.0
     # via rocm-docs-core
 sphinxcontrib-applehelp==2.0.0
     # via sphinx
-sphinxcontrib-bibtex==2.6.3
+sphinxcontrib-bibtex==2.6.4
     # via -r requirements.in
 sphinxcontrib-devhelp==2.0.0
     # via sphinx