[code] point back to main branch (#18887)

Author: jeanp413

.github/workflows/code-nightly.yml

@@ -31,7 +31,7 @@ jobs:
         run: |
           export LEEWAY_WORKSPACE_ROOT=$GITHUB_WORKSPACE
 
-          codeHeadCommit=$(curl -H 'Accept: application/vnd.github.VERSION.sha' https://api.github.com/repos/gitpod-io/openvscode-server/commits/gp-code/release/1.83)
+          codeHeadCommit=$(curl -H 'Accept: application/vnd.github.VERSION.sha' https://api.github.com/repos/gitpod-io/openvscode-server/commits/gp-code/main)
           codeVersion=$(curl https://raw.githubusercontent.com/gitpod-io/openvscode-server/$codeHeadCommit/package.json | jq .version)
           cd components/ide/code
           leeway build \