Release `v0.22.2`

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0797113) 90.83% compared to head (44d27d1) 90.83%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #271 +/- ## ======================================= Coverage 90.83% 90.83% ======================================= Files 21 21 Lines 2974 2974 ======================================= Hits 2701 2701 Misses 273 273 ``` | [Impacted Files](https://app.codecov.io/gh/aiidateam/plumpy/pull/271?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam) | Coverage Δ | | |---|---|---| | [src/plumpy/\_\_init\_\_.py](https://app.codecov.io/gh/aiidateam/plumpy/pull/271?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidateam#diff-c3JjL3BsdW1weS9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | |

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