Error building on MacOS

### Expected behaviour



opencv-python builds on MacOS



### Actual behaviour



Receive an error stating:

```

ERROR: Cannot install numpy==1.21.2 and numpy==1.21.4 because these package versions have conflicting dependencies.



  The conflict is caused by:

      The user requested numpy==1.21.2

      The user requested numpy==1.21.4

```



- operating system == 12.6

- architecture (e.g. x86) == x86

- opencv-python version == 4.7.0.68 (commit 339bca5 on 4.x branch)



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##### Fix

To me, this looks like an issue in the `pyroject.toml` requires array, with conflicting versions if your are running python >= 3.10 on Mac.



Specifically these lines:



```

  "numpy==1.21.2; python_version>='3.10'",

  "numpy==1.21.4; python_version>='3.10' and platform_system=='Darwin'",

```



should probably be:



```

  "numpy==1.21.2; python_version>='3.10' and platform_system!='Darwin'",

  "numpy==1.21.4; python_version>='3.10' and platform_system=='Darwin'",

```



Otherwise when python >= 3.10 and platform_system == "Darwin" it will want both numpy 1.21.2 (to satisfy the first condition) and numpy 1.21.4 (to satisfy the second).

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