Revert "send email on merge failure"

This reverts commit 5271e92ab22749cbb70be6a8c7a656d870c069b7.

.github/workflows/merge-upstream-master.yml

@@ -40,22 +40,3 @@ jobs:
     # Step 4: Print a helpful timestamp for your records (not required, just nice)
     - name: Timestamp
       run: date
-
-    - name: Send email
-      if: failure()
-      uses: dawidd6/action-send-mail@v3.2.0
-      with:
-          # mail server settings
-          server_address: smtp.gmail.com
-          server_port: 465
-          # user credentials
-          username: ${{ secrets.EMAIL }}
-          password: ${{ secrets.EMAIL_PASSWORD }}
-          # email subject
-          subject: ${{ github.job }} job of ${{ github.repository }} has ${{ job.status }}
-          # email body as text
-          body: ${{ github.job }} job in worflow ${{ github.workflow }} of ${{ github.repository }} has ${{ job.status }}
-          # comma-separated string, send email to
-          to:  ${{ secrets.EMAIL }}
-          # from email name
-          from: Github Action