Fix workflow and two issues

[RobertoPrevato]

• Fix the build
• Improves exception handling so it is possible to specify how specific types of HTTPException must be handled (#342).
• Improves the error message when a list of objects if expected for an incoming request body, and a non-list value is received (#341).

[codecov-commenter]

Codecov Report

Patch coverage: 93.33% and project coverage change: -0.02 :warning:

Comparison is base (efb08bd) 97.71% compared to head (d0cd317) 97.70%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #343 +/- ## ========================================== - Coverage 97.71% 97.70% -0.02% ========================================== Files 66 66 Lines 6167 6181 +14 ========================================== + Hits 6026 6039 +13 - Misses 141 142 +1 ``` | [Impacted Files](https://codecov.io/gh/Neoteroi/BlackSheep/pull/343?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Neoteroi) | Coverage Δ | | |---|---|---| | [blacksheep/server/bindings.py](https://codecov.io/gh/Neoteroi/BlackSheep/pull/343?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Neoteroi#diff-YmxhY2tzaGVlcC9zZXJ2ZXIvYmluZGluZ3MucHk=) | `99.53% <80.00%> (-0.23%)` | :arrow_down: | | [blacksheep/\_\_init\_\_.py](https://codecov.io/gh/Neoteroi/BlackSheep/pull/343?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Neoteroi#diff-YmxhY2tzaGVlcC9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | |

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