Docs: update links from build images
@@ -319,8 +319,8 @@ The Docker image used for building the docs.
Each image support different Python versions and has different packages installed,
as defined here:
-* `stable <https://github.com/readthedocs/readthedocs-docker-images/tree/releases/4.x>`_: :buildpyversions:`stable`
-* `latest <https://github.com/readthedocs/readthedocs-docker-images/tree/releases/5.x>`_: :buildpyversions:`latest`
+* `stable <https://github.com/readthedocs/readthedocs-docker-images/tree/releases/5.x>`_: :buildpyversions:`stable`
+* `latest <https://github.com/readthedocs/readthedocs-docker-images/tree/releases/6.x>`_: :buildpyversions:`latest`
sphinx
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