Update tests.yml

Author: insolor

.github/workflows/tests.yml

@@ -48,7 +48,9 @@ jobs:
     
       - name: Upload coverage data to coveralls.io
         continue-on-error: true
-        run: pipx run coveralls --service=github
+        run: |
+          pip install coveralls
+          coveralls --service=github
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COVERALLS_FLAG_NAME: ${{ matrix.python-version }}
@@ -62,6 +64,8 @@ jobs:
     steps:
     - name: Finished
       continue-on-error: true
-      run: pipx run coveralls --finish
+      run: |
+        pip install coveralls
+        coveralls --finish
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}