remove references to v3 from release-branch.yml

Author: sean-breen

.github/workflows/release-branch.yml

@@ -28,7 +28,7 @@ on:
         default: false
         type: boolean
       createPullRequest:
-        description: 'Create pull request back into v3'
+        description: 'Create pull request back into main'
         default: false
         type: boolean
       releaseBranch:
@@ -287,7 +287,7 @@ jobs:
 
   merge-release:
     if: ${{ needs.vars.outputs.create_pull_request == 'true' }}
-    name: Merge release branch back into V3 branch
+    name: Merge release branch back into main branch
     runs-on: ubuntu-22.04
     needs: [vars,tag-release]
     permissions:
@@ -304,11 +304,11 @@ jobs:
           script: |
             const { repo, owner } = context.repo;
             const result = await github.rest.pulls.create({
-              title: 'Merge ${{ github.ref_name }} back into v3',
+              title: 'Merge ${{ github.ref_name }} back into main',
               owner,
               repo,
               head: '${{ github.ref_name }}',
-              base: 'v3',
+              base: 'main',
               body: [
                 'This PR is auto-generated by the release workflow.'
               ].join('\n')