fixed missing dependencies and added abosulte path to SIA.py

[LckyLke]

Thanks for the great work :)

I added some depencies that were missing and added the path as an absoulte path to SIA.py
Otherwise the datahandler breaks when not run from the correct dir.

Ie:

Traceback (most recent call last):
  File "/home/lukef/Dokumente/GitHub/districtgenerator/temp.py", line 86, in _generate_with_districtgenerator
    data.generateBuildings()
  File "/home/lukef/Dokumente/GitHub/districtgenerator/districtgenerator/classes/datahandler.py", line 630, in generateBuildings
    building["user"] = Users(building=building["buildingFeatures"]["building"],
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lukef/Dokumente/GitHub/districtgenerator/districtgenerator/classes/users.py", line 119, in __init__
    self.SIA2024 = SIA.read_SIA_data()
                   ^^^^^^^^^^^^^^^^^^^
  File "/home/lukef/Dokumente/GitHub/districtgenerator/districtgenerator/functions/SIA.py", line 8, in read_SIA_data
    data = pd.read_excel('../districtgenerator/data/SIA2024.xlsx', sheet_name='SIA2024', header=1)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lukef/miniconda3/envs/temp_dist/lib/python3.11/site-packages/pandas/io/excel/_base.py", line 495, in read_excel
    io = ExcelFile(
         ^^^^^^^^^^
  File "/home/lukef/miniconda3/envs/temp_dist/lib/python3.11/site-packages/pandas/io/excel/_base.py", line 1550, in __init__
    ext = inspect_excel_format(
          ^^^^^^^^^^^^^^^^^^^^^
  File "/home/lukef/miniconda3/envs/temp_dist/lib/python3.11/site-packages/pandas/io/excel/_base.py", line 1402, in inspect_excel_format
    with get_handle(
         ^^^^^^^^^^^
  File "/home/lukef/miniconda3/envs/temp_dist/lib/python3.11/site-packages/pandas/io/common.py", line 882, in get_handle
    handle = open(handle, ioargs.mode)
             ^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '../districtgenerator/data/SIA2024.xlsx'