Bump readthedocs/actions from 1.2 to 1.5

Bumps [readthedocs/actions](https://github.com/readthedocs/actions) from 1.2 to 1.5.
- [Commits](readthedocs/actions@cc09204...b8bba14)

---
updated-dependencies:
- dependency-name: readthedocs/actions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/rtd-preview-link.yml

@@ -14,6 +14,6 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-      - uses: readthedocs/actions/preview@cc0920454cf03ca8a3fbd3cbaa2ce2e509e70636
+      - uses: readthedocs/actions/preview@b8bba1484329bda1a3abe986df7ebc80a8950333
         with:
           project-slug: "pydata-sphinx-theme"