Use coveralls<4.0.0 for GA coverage as we still use py2.7

Author: gbastien

.github/workflows/main.yml

@@ -57,7 +57,7 @@ jobs:
             continue-on-error: false
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: packages
         run: |
           sudo apt-get update
@@ -94,7 +94,7 @@ jobs:
       - name: Install Coveralls
         run: |
           pip3 install -U pip setuptools --no-cache-dir
-          pip3 install -U "coveralls>=3.0.0" coverage==5.3.1 --no-cache-dir
+          pip3 install -U "coveralls<4.0.0" coverage==5.3.1 --no-cache-dir
       - name: Publish to Coveralls
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}