[BUILD] Python version updated to 3.8.12

Moved to the latest security release, as porposed
by @barbieri.

* Updated Pipfile, and resulting changes in Pipfile.lock
* Updated buildscript
* Updated README.md

Signed-off-by: Daniel Wilms <Daniel.DW.Wilms@bmw.de>

.github/workflows/buildcheck.yml

@@ -14,7 +14,7 @@ jobs:
           # required in `Pipfile`.
           curl https://pyenv.run | bash
           export PATH="$HOME/.pyenv/bin:$PATH"
-          pyenv install 3.8.5
+          pyenv install 3.8.12
       - name: Install dependencies
         run: |
           python -V

Pipfile

@@ -15,4 +15,4 @@ vss-tools = {editable = true, path = "."}
 [dev-packages]
 
 [requires]
-python_version = "3.8.5"
+python_version = "3.8.12"

README.md

@@ -36,7 +36,7 @@ All current tools are based on common Python functionality in the `vspec` folder
 ## Getting started
 
 ### Prerequisites
-* Python 3.7 installed
+* Python 3.8.12 installed
 * If the installation (pip install) is executed behind a (corporate) proxy, the following environments variables must be set: `http_proxy` and `https_proxy` (including authentication e.g., `http://${proxy_username):$(proxy_password)@yourproxy.yourdomain`)
 * If you do not run with administration rights, you may need to configure pip target path to write to your user home directory or consider [using the `pipenv` method](#setup-with-pipenv).
 
@@ -70,9 +70,9 @@ curl https://pyenv.run | bash  # download and install
 exec $SHELL                    # restart your shell using the new $PATH
 ```
 
-Make sure Python version 3.8.5 is installed:
+Make sure Python version 3.8.12 is installed:
 ```sh
-pyenv install 3.8.5  # install the versions required by Pipfile
+pyenv install 3.8.12  # install the versions required by Pipfile
 ```
 
 Install this project and its dependencies in the local `.venv` folder in this project, then use it (`pipenv shell`):