Bump actions/setup-python from 3 to 4 (#46)

* Bump actions/setup-python from 3 to 4

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update main.yml

python-version: '3.x'

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: oittaa <8972248+oittaa@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -13,7 +13,9 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
       - uses: psf/black@stable
 
   build:
@@ -24,7 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies

.github/workflows/publish-to-test-pypi.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python 3.x
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version: '3.x'
     - name: Install pypa/build