Bump 18 from alpha to beta (#22766)

.circleci/config.yml

@@ -464,7 +464,7 @@ workflows:
             - setup
           commit_sha: << pipeline.parameters.prerelease_commit_sha >>
           release_channel: stable
-          dist_tag: "next,alpha"
+          dist_tag: "next,beta"
       - publish_prerelease:
           name: Publish to Experimental channel
           requires:
@@ -496,7 +496,7 @@ workflows:
             - setup
           commit_sha: << pipeline.git.revision >>
           release_channel: stable
-          dist_tag: "next,alpha"
+          dist_tag: "next,beta"
       - publish_prerelease:
           name: Publish to Experimental channel
           requires:

ReactVersions.js

@@ -22,7 +22,7 @@ const ReactVersion = '18.0.0';
 
 // The label used by the @next channel. Represents the upcoming release's
 // stability. Could be "alpha", "beta", "rc", etc.
-const nextChannelLabel = 'alpha';
+const nextChannelLabel = 'beta';
 
 const stablePackages = {
   'create-subscription': ReactVersion,