Add support to python 3.10

[jairhenrique]

Configure CI to run tests on python 3.10.

[timjklein36]

@jairhenrique Thank you for your effort on contributing to the project!

I have a couple of comments:

• First, please add a description to your PR so that the reviewers and other contributors can understand the scope of the changes and your intent.
• Since some of the file changes in this PR have only formatting related changes, please try to limit the changes to only that which affect the feature/issue at hand. Specifically, the changes to the following files should be reverted, since they do not contribute any meaningful change in behavior:
  • .github/dependabot.yml
  • .github/workflows/changelog.yml
• Some other files with semantic updates (3.9 to 3.10) contain other unnecessary formatting changes (for example, introducing quotes around the version numbers). Please try to retain the original formatting in these files so that the history only shows meaningful changes, instead of many style/formatting ones.

[jairhenrique]

@timjklein36 the config of my code editor auto formats files, sorry for that.

If I put 3.10 whitout quotes, github actions interprets as 3.1 version.

[timjklein36]

@jairhenrique That makes sense, actually, because of how yaml handles numbers and text. Thanks for the clarification on that.

[timjklein36]

Looks good! Just one minor update to the wording in the CHANGELOG would be great.

[berinhard]

Thanks!