[CI] Fix coveralls

Author: stephane-caron

.github/workflows/test.yml

@@ -23,7 +23,8 @@ jobs:
 
             - name: "Install dependencies"
               run: |
-                  python -m pip install -U pip tox tox-gh-actions
+                  python -m pip install --upgrade pip
+                  python -m pip install coveralls tox tox-gh-actions
 
             - name: "Check coverage"
               run: |
@@ -50,7 +51,8 @@ jobs:
 
             - name: "Install dependencies"
               run: |
-                  python -m pip install -U pip tox tox-gh-actions
+                  python -m pip install --upgrade pip
+                  python -m pip install tox tox-gh-actions
 
             - name: "Check code format"
               run: |
@@ -76,7 +78,8 @@ jobs:
 
             - name: "Install dependencies"
               run: |
-                  python -m pip install -U pip tox tox-gh-actions
+                  python -m pip install --upgrade pip
+                  python -m pip install tox tox-gh-actions
 
             - name: "Run loader tests"
               run: |