Crash when icon is an SVG file

[JulianGro]

Apparently, appimagelint crashes when checking SVG icons:

(…)
appimagelint.icons_check[634069] [INFO] Checking resolution of icon: /tmp/.mount_runtimMlomJg/interface.svg
appimagelint.icons_check[634069] [DEBUG] Opening image: /tmp/.mount_runtimMlomJg/interface.svg
appimagelint.appimagemounter[634069] [DEBUG] unmounting AppImage
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/__main__.py", line 4, in <module>
    run()
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/cli.py", line 142, in run
    for testres in check.run():
                   ^^^^^^^^^^^
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/checks/icons.py", line 97, in run
    valid = self._check_icon_for_valid_resolution(icon)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/checks/icons.py", line 279, in _check_icon_for_valid_resolution
    res = self._get_icon_res(icon_path)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/checks/icons.py", line 249, in _get_icon_res
    resolution = self._get_svg_icon_res(icon_path)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/.mount_appimaNbEPeA/usr/conda/lib/python3.12/site-packages/appimagelint/checks/icons.py", line 213, in _get_svg_icon_res
    return float(height), float(width)
           ^^^^^^^^^^^^^
ValueError: could not convert string to float: '14.816667mm'
juliangro@x299-workstation ~/g/o/build (conan) [1]> 

This is running version unknown-git24d3bf6. Here is the offending SVG file for reference:

I guess, the resolution check should just be skipped on SVG files.