build(deps): bump actions/setup-python from 2 to 3

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 3.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2...v3)

---
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>

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
         python-version: [3.6, 3.7, 3.8, 3.9, '3.10']  # jsonschema has a pypy-3.7 bug https://github.com/Julian/jsonschema/issues/828
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}
       - id: pip-cache

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v3
         with:
           python-version: 3.8
       - uses: actions/cache@v2

.github/workflows/pypi.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v1
+      - uses: actions/setup-python@v3
         with:
           python-version: 3.8
       - run: pip install --upgrade setuptools wheel