Bump rocm-docs-core[api-reference] from 1.18.1 to 1.20.0 in /docs/sphinx

Bumps [rocm-docs-core[api-reference]](https://github.com/ROCm/rocm-docs-core) from 1.18.1 to 1.20.0.
- [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/v1.18.1...v1.20.0)

---
updated-dependencies:
- dependency-name: rocm-docs-core[api-reference]
  dependency-version: 1.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

docs/sphinx/requirements.in

@@ -1 +1 @@
-rocm-docs-core[api-reference]==1.18.1
+rocm-docs-core[api-reference]==1.20.0

docs/sphinx/requirements.txt

@@ -226,8 +226,8 @@ requests==2.32.3
     # via
     #   pygithub
     #   sphinx
-rocm-docs-core[api-reference]==1.18.1
-    # via -r docs/sphinx/requirements.in
+rocm-docs-core[api-reference]==1.20.0
+    # via -r requirements.in
 rpds-py==0.23.1
     # via
     #   jsonschema