Revert "ci.yaml and pr.yaml update (#6218)"

This reverts commit 30843d2.

Author: mvdbeek

.github/workflows/ci.yaml

@@ -150,7 +150,6 @@ jobs:
       id: cpu-cores
     - name: Clean dotnet folder for space
       run: rm -Rf /usr/share/dotnet
-    - run: python -m pip install pillow tifffile
     - name: Planemo test
       uses: galaxyproject/planemo-ci-action@v1
       id: test

.github/workflows/pr.yaml

@@ -290,7 +290,6 @@ jobs:
       id: cpu-cores
     - name: Clean dotnet folder for space
       run: rm -Rf /usr/share/dotnet
-    - run: python -m pip install pillow tifffile
     - name: Planemo test
       uses: galaxyproject/planemo-ci-action@v1
       id: test