Bump actions/setup-python from 1 to 4 (dev-sec#611)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 1 to 4.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v1...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>

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

.github/workflows/mysql_hardening.yml

@@ -47,7 +47,7 @@ jobs:
           submodules: true
 
       - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 

.github/workflows/nginx_hardening.yml

@@ -46,7 +46,7 @@ jobs:
           submodules: true
 
       - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 

.github/workflows/os_hardening.yml

@@ -45,7 +45,7 @@ jobs:
           submodules: true
 
       - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 

.github/workflows/ssh_hardening.yml

@@ -46,7 +46,7 @@ jobs:
           submodules: true
 
       - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7
 

.github/workflows/ssh_hardening_custom_tests.yml

@@ -46,7 +46,7 @@ jobs:
           submodules: true
 
       - name: Set up Python 3.7
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: 3.7