BUG: Fix Mapping and Iterables names import modules

Fix `Mapping` and `Iterables` classes import modules: import them from
`collections.abc` instead of from `collections` as they have been moved
to the former since Python 3.3.

Fixes:
```
Traceback (most recent call last):
  File ".virtualenvs/tract_querier/bin/tract_math", line 8, in <module>
    sys.exit(main())
  File ".virtualenvs/tract_querier/lib/python3.10/site-packages/scripts/tract_math.py", line 33, in main
    from tract_querier.tract_math import operations
  File ".virtualenvs/tract_querier/lib/python3.10/site-packages/tract_querier/tract_math/__init__.py", line 3, in <module>
    from .decorator import tract_math_operation, TractMathWrongArgumentsError
  File ".virtualenvs/tract_querier/lib/python3.10/site-packages/tract_querier/tract_math/decorator.py", line 3, in <module>
    from collections import Mapping, Iterable
ImportError: cannot import name 'Mapping' from 'collections' (/usr/lib/python3.10/collections/__init__.py)
```

Documentation:
https://docs.python.org/3.3/library/collections.abc.html

tract_querier/tract_math/decorator.py

@@ -1,6 +1,6 @@
 import inspect
 from itertools import repeat
-from collections import Mapping, Iterable
+from collections.abc import Mapping, Iterable
 import io
 import csv
 from os import path