Bump python from 3.8 to 3.9 to unbreak CI

Author: Mikolaj

.github/workflows/artifacts.yml

@@ -23,12 +23,12 @@ jobs:
         run: |
           add-apt-repository ppa:deadsnakes/ppa
           apt-get update
-          apt-get install -y python3.8
+          apt-get install -y python3.9
       - uses: actions/checkout@v2
       - name: Package project
         run: |
           cabal v2-sdist --builddir=sdist Cabal cabal-install-solver cabal-install
-          python3.8 release.py --tarlib=sdist/sdist/Cabal-*.tar.gz --tarsolver=sdist/sdist/cabal-install-solver-3.*.tar.gz --tarexe=sdist/sdist/cabal-install-3.*.tar.gz
+          python3.9 release.py --tarlib=sdist/sdist/Cabal-*.tar.gz --tarsolver=sdist/sdist/cabal-install-solver-3.*.tar.gz --tarexe=sdist/sdist/cabal-install-3.*.tar.gz
       - uses: actions/upload-artifact@v2
         with:
           name: cabal-linux

templates/ci-artifacts.template.yml

@@ -23,12 +23,12 @@ jobs:
         run: |
           add-apt-repository ppa:deadsnakes/ppa
           apt-get update
-          apt-get install -y python3.8
+          apt-get install -y python3.9
       - uses: actions/checkout@v2
       - name: Package project
         run: |
           cabal v2-sdist --builddir=sdist Cabal cabal-install-solver cabal-install
-          python3.8 release.py --tarlib=sdist/sdist/Cabal-*.tar.gz --tarsolver=sdist/sdist/cabal-install-solver-3.*.tar.gz --tarexe=sdist/sdist/cabal-install-3.*.tar.gz
+          python3.9 release.py --tarlib=sdist/sdist/Cabal-*.tar.gz --tarsolver=sdist/sdist/cabal-install-solver-3.*.tar.gz --tarexe=sdist/sdist/cabal-install-3.*.tar.gz
       - uses: actions/upload-artifact@v2
         with:
           name: cabal-linux