Set minimum Python version for oocmap

[soldni]

Clang fails compilation on my M1 Mac with Python <= 3.8:

      clang -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -fwrapv -O2 -Wall -fPIC -O2 -isystem /Users/lucas/miniforge3/envs/oocmap/include -arch arm64 -fPIC -O2 -isystem /Users/lucas/miniforge3/envs/oocmap/include -arch arm64 -I/opt/homebrew/opt/mysql-client/include -I/Users/lucas/miniforge3/envs/oocmap/include/python3.8 -c lazydict.cpp -o build/temp.macosx-11.0-arm64-cpython-38/lazydict.o
      lazydict.cpp:281:12: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          return PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictItemsType), pySelf);
                 ^~~~~~~~~~~~~~~~~~~
                 PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      lazydict.cpp:285:12: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          return PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictKeysType), pySelf);
                 ^~~~~~~~~~~~~~~~~~~
                 PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      lazydict.cpp:289:12: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          return PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictValuesType), pySelf);
                 ^~~~~~~~~~~~~~~~~~~
                 PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      lazydict.cpp:293:12: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          return PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictKeysIterType), pySelf);
                 ^~~~~~~~~~~~~~~~~~~
                 PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      lazydict.cpp:759:33: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          PyObject* const itemsIter = PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictItemsIterType), dictObject);
                                      ^~~~~~~~~~~~~~~~~~~
                                      PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      lazydict.cpp:940:33: error: use of undeclared identifier 'PyObject_CallOneArg'; did you mean 'PyObject_CallObject'?
          PyObject* const itemsIter = PyObject_CallOneArg(reinterpret_cast<PyObject*>(&OOCLazyDictItemsIterType), dictObject);
                                      ^~~~~~~~~~~~~~~~~~~
                                      PyObject_CallObject
      /Users/lucas/miniforge3/envs/oocmap/include/python3.8/abstract.h:163:24: note: 'PyObject_CallObject' declared here
      PyAPI_FUNC(PyObject *) PyObject_CallObject(PyObject *callable,
                             ^
      6 errors generated.
      error: command '/usr/bin/clang' failed with exit code 1
      [end of output]

OOCMap builds and installs fine on Python 3.9.