Fix CI warning annotations

- replace deprecated set-output command
- use a supported version of gh-action-pypi-publish action

.github/workflows/pythontests.yml

@@ -23,7 +23,8 @@ jobs:
     - name: Get pip cache dir
       id: pip-cache
       run: |
-        echo "::set-output name=dir::$(pip cache dir)"
+        echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
+        echo "dir=$(pip cache dir)" >> $env:GITHUB_OUTPUT
     - name: pip cache
       uses: actions/cache@v4
       with:
@@ -60,7 +61,8 @@ jobs:
       id: pip-cache
       run: |
         python -m pip install -U pip # to ensure version > 20 to have cache dir
-        echo "::set-output name=dir::$(pip cache dir)"
+        echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
+        echo "dir=$(pip cache dir)" >> $env:GITHUB_OUTPUT
     - name: pip cache
       uses: actions/cache@v4
       with:
@@ -106,7 +108,7 @@ jobs:
         cd main
         python setup.py sdist bdist_wheel
     - name: Publish package to PyPI
-      uses: pypa/gh-action-pypi-publish@master
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         packages_dir: main/dist/
         user: __token__