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>

Author: dependabot[bot]

.github/workflows/ci-tests.yml

@@ -47,7 +47,7 @@ jobs:
         run: sudo usermod -c 'CI Runner' $(whoami)
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ env.py-semver }}
           cache: pip
@@ -95,7 +95,7 @@ jobs:
           fetch-depth: 0
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ env.py-semver }}
           cache: pip
@@ -131,7 +131,7 @@ jobs:
           singularity-version: ${{ env.singularity_version }}
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: 3.9
           cache: pip
@@ -157,7 +157,7 @@ jobs:
           singularity-version: ${{ env.singularity_version }}
 
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: "3.10"  # quoted, otherwise that turns into the number 3.1
           cache: pip