Update doc for pre-release (#10014)

* Update doc for pre-release

* Use stable as default

* Use the right commit :facepalms:

.circleci/deploy.sh

@@ -55,4 +55,5 @@ deploy_doc "eb0e0ce" v3.4.0
 deploy_doc "818878d" v3.5.1
 deploy_doc "c781171" v4.0.0
 deploy_doc "bfa4ccf" v4.1.1
-deploy_doc "7d9a9d0" # v4.2.0 Latest stable release
+deploy_doc "7d9a9d0" # v4.2.1 Latest stable release
+deploy_doc "4cd22r1" v4.3.0 # Pre-release
\ No newline at end of file

docs/source/_static/js/custom.js

 // These two things need to be updated at each release for the version selector.
 // Last stable version
-const stableVersion = "v4.2.0"
+const stableVersion = "v4.2.1"
 // Dictionary doc folder to label. The last stable version should have an empty key.
 const versionMapping = {
     "master": "master",
+    "v4.3.0": "v4.3.0 (pre)",
     "": "v4.2.0/v4.2.1 (stable)",
     "v4.1.1": "v4.1.0/v4.1.1",
     "v4.0.1": "v4.0.0/v4.0.1",