actions: allow coveralls.io errors

Author: asher-m

.github/workflows/test.yml

@@ -46,6 +46,7 @@ jobs:
         pytest --cov=UncertainSCI
 
     - name: Upload coverage data to coveralls.io
+      continue-on-error: true
       run: |
         pip install coveralls
         coveralls --service=github
@@ -62,6 +63,7 @@ jobs:
 
     steps:
     - name: Finished
+      continue-on-error: true
       run: |
         pip3 install --upgrade pip
         pip3 install --upgrade coveralls