Update Python to 3.8.3

The actions/setup-python action no longer offers Python 3.8.2, so 3.8.3 must now be used in the CI workflow. It makes sense to use the same Python version to run the action as we do to test it, so the version used in the Docker container is also updated.

Author: per1234

.github/workflows/libraries_report-size-deltas.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: '3.8.2'
+          python-version: '3.8.3'
 
       - name: Install dependencies
         run: |

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.8.2
+FROM python:3.8.3
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY reportsizedeltas.py /reportsizedeltas.py