fix: relax typing on _fn_result_to_body to allow Any

[bdraco]

another cython3 fix for incorrect typing

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.07% ⚠️

Comparison is base (c40c7bc) 82.46% compared to head (2e29bd8) 82.40%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
- Coverage   82.46%   82.40%   -0.07%     
==========================================
  Files          27       27              
  Lines        3171     3171              
  Branches      655      655              
==========================================
- Hits         2615     2613       -2     
- Misses        342      343       +1     
- Partials      214      215       +1     

Files Changed	Coverage Δ
src/dbus_fast/__version__.py	0.00% <0.00%> (ø)
src/dbus_fast/service.py	88.65% <ø> (ø)

... and 1 file with indirect coverage changes

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