Added client_secret and refresh token function

[rkentish]

Description

• Added client_secret to configuration object and basic auth header for token request
• Added new function to use refresh token to aquire new grant
• Updated version number to 1.6.3

[rkentish]

@timo-reymann thanks for this lib, helped me simplify a little command line utility for myself that other libraries were making way to complicated. I've put through a small PR to add the ability to specify the client secret and obtain a new grant with the refresh token as I needed these for my project.

Not sure if I've doen the PR correctly as it's my first one I've ever submitted so let me know if there's something eles I need to do.

[timo-reymann]

Thank you so much for your PR, I just have some smaller comments mostly for keeping backward compability :)

(I use https://conventionalcomments.org/ for writing the review comments)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rkentish]

@timo-reymann implemented those suggestions and added the new test (plus one extra). I was getting port conflicts so implemented random port selection for testing but now getting security warnings. Probably not a real risk but will leave it up to you to decide 😄

Couldn't completely remove the client_secret from the tests as it complained about missing params in the constructor. I'm guessing it's a default constructor based of the class members (?) but without defining an explicit constructor I wasn;t sure how to fix. I figured setting it to None had the same effect?

[timo-reymann]

Thanks a lot 🚀

[timo-reymann]

🎉 This PR is included in version 2.0.0 🎉

The release is available on GitHub release

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