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](https://github.com/actions/setup-python/compare/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

@@ -55,7 +55,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python (for SCons)
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.x'
 
@@ -157,7 +157,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python (for SCons)
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.x'
 
@@ -210,7 +210,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python (for SCons)
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.x'
 
@@ -249,7 +249,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python (for SCons)
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.x'