Bump ansible-core from 2.11.3 to 2.12.1 (#14375)

* Bump ansible-core from 2.11.3 to 2.12.1

Bumps [ansible-core](https://github.com/ansible/ansible) from 2.11.3 to 2.12.1.
- [Release notes](https://github.com/ansible/ansible/releases)
- [Commits](https://github.com/ansible/ansible/compare/v2.11.3...v2.12.1)

---
updated-dependencies:
- dependency-name: ansible-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update requirements.txt

* python and cache for actions

* switch to python 3.8

* wait for lxc network

* no point to support 18.04 in tests

* cipher fix for openssl_privatekey

* cipher fix for openssl_privatekey

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jack Ivanov <17044561+jackivanov@users.noreply.github.com>

.github/workflows/main.yml

@@ -9,7 +9,8 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2.3.1
         with:
-          python-version: '3.7'
+          python-version: '3.9'
+          cache: 'pip'
 
       - name: Install dependencies
         run: |
@@ -29,12 +30,13 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        UBUNTU_VERSION: ["18.04", "20.04"]
+        UBUNTU_VERSION: ["20.04"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2.3.1
         with:
-          python-version: '3.7'
+          python-version: '3.9'
+          cache: 'pip'
 
       - name: Install dependencies
         run: |
@@ -88,12 +90,13 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        UBUNTU_VERSION: ["18.04", "20.04"]
+        UBUNTU_VERSION: ["20.04"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2.3.1
         with:
-          python-version: '3.7'
+          python-version: '3.9'
+          cache: 'pip'
 
       - name: Install dependencies
         run: |