Bump actions/setup-python from 2.3.2 to 4.3.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2.3.2 to 4.3.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v2.3.2...v4.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/fortnightly.yml

@@ -47,7 +47,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2.3.2
+      uses: actions/setup-python@v4.3.0
       with:
         python-version: ${{ matrix.python }}
     - name: Install Python dependencies

.github/workflows/testing.yml

@@ -36,7 +36,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2.3.2
+      uses: actions/setup-python@v4.3.0
       with:
         python-version: ${{ matrix.python }}
     - name: Install Python dependencies
@@ -90,7 +90,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2.3.2
+      uses: actions/setup-python@v4.3.0
       with:
         python-version: ${{ matrix.python }}
     - name: Install Python dependencies
@@ -116,7 +116,7 @@ jobs:
       with:
         fetch-depth: 0
     - name: Set up Python
-      uses: actions/setup-python@v2.3.2
+      uses: actions/setup-python@v4.3.0
       with:
         python-version: 3.8
     - name: Install Python dependencies
@@ -138,7 +138,7 @@ jobs:
         git fetch --prune --unshallow
         git fetch --depth=1 origin +refs/tags/*:refs/tags/*
     - name: Set up Python 3.7
-      uses: actions/setup-python@v2.3.2
+      uses: actions/setup-python@v4.3.0
       with:
         python-version: 3.7
     - name: Install requirements