Add python 3.10 to testing.yaml

[codecov-commenter]

Codecov Report

Base: 72.09% // Head: 72.07% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (8f36309) compared to base (d276a4f). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #69 +/- ## =========================================== - Coverage 72.09% 72.07% -0.02% =========================================== Files 17 17 Lines 3612 3613 +1 =========================================== Hits 2604 2604 - Misses 1008 1009 +1 ``` | [Impacted Files](https://codecov.io/gh/opencybersecurityalliance/firepit/pull/69?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencybersecurityalliance) | Coverage Δ | | |---|---|---| | [firepit/woodchipper.py](https://codecov.io/gh/opencybersecurityalliance/firepit/pull/69/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencybersecurityalliance#diff-ZmlyZXBpdC93b29kY2hpcHBlci5weQ==) | `72.99% <0.00%> (-0.16%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencybersecurityalliance). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opencybersecurityalliance)

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