Bump actions/setup-python from 3 to 4 (#625)

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>

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

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ 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: Set up Miniconda
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python 3.9
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
       - name: Install Nox-under-test
@@ -44,7 +44,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python 3.9
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: 3.9
       - name: Install Nox-under-test

action.yml

@@ -7,26 +7,26 @@ branding:
 runs:
   using: composite
   steps:
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "pypy-3.7"
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "pypy-3.8"
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "pypy-3.9"
 
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.7"
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.8"
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.9"
-    - uses: actions/setup-python@v3
+    - uses: actions/setup-python@v4
       with:
         python-version: "3.10"