Bump rocm-docs-core from 1.2.1 to 1.4.0 in /docs/sphinx

Bumps [rocm-docs-core](https://github.com/ROCm/rocm-docs-core) from 1.2.1 to 1.4.0.
- [Release notes](https://github.com/ROCm/rocm-docs-core/releases)
- [Changelog](https://github.com/ROCm/rocm-docs-core/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/ROCm/rocm-docs-core/compare/v1.2.1...v1.4.0)

---
updated-dependencies:
- dependency-name: rocm-docs-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Change-Id: I60c2d94a447b71ca0ce26a87b7f55b055b8aff8e

docs/sphinx/requirements.in

@@ -1 +1 @@
-rocm-docs-core==1.2.1
+rocm-docs-core==1.4.0

docs/sphinx/requirements.txt

@@ -92,7 +92,7 @@ requests==2.31.0
     # via
     #   pygithub
     #   sphinx
-rocm-docs-core==1.2.1
+rocm-docs-core==1.4.0
     # via -r requirements.in
 smmap==5.0.1
     # via gitdb