GitHub Actions: Fix several outdated comments

(cherry picked from commit 29618a2)

Author: acogoluegnes

.github/workflows/release-4.1.x-alphas.yaml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - name: Compute prerelease identifier from commit SHA
         run: echo "PRERELEASE_IDENTIFIER=`echo ${{ github.sha }} | cut -c1-8`" >> $GITHUB_ENV
-      - name: Trigger a 4.0.x alpha build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
+      - name: Trigger a 4.1.x alpha build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
         uses: peter-evans/repository-dispatch@v4
         with:
           token: ${{ secrets.MK_RELEASE_AUTOMATION_TOKEN }}

.github/workflows/release-4.2.x-alphas.yaml

@@ -3,8 +3,7 @@ on:
   workflow_dispatch:
   push:
     branches:
-      # 4.2.x
-      - "main"
+      - "v4.2.x"
     paths:
       - "deps/*/src/**"
       - 'deps/rabbitmq_management/priv/**'
@@ -18,7 +17,7 @@ jobs:
     steps:
       - name: Compute prerelease identifier from commit SHA
         run: echo "PRERELEASE_IDENTIFIER=`echo ${{ github.sha }} | cut -c1-8`" >> $GITHUB_ENV
-      - name: Trigger a 4.0.x alpha build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
+      - name: Trigger a 4.2.x alpha build in ${{ env.DEV_WORKFLOW_REPOSITORY }}
         uses: peter-evans/repository-dispatch@v4
         with:
           token: ${{ secrets.MK_RELEASE_AUTOMATION_TOKEN }}