Remove deprecation message and code related to old API.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• [ ] Reference issues which can be closed due to this PR with "Closes #x".
• [ ] Review whether the documentation needs to be updated.
• [ ] Document PR in CHANGES.md.

[codecov[bot]]

Codecov Report

Merging #50 (885be92) into main (9c2ffd6) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
- Coverage   99.83%   99.83%   -0.01%     
==========================================
  Files          17       17              
  Lines         623      610      -13     
==========================================
- Hits          622      609      -13     
  Misses          1        1              

Flag	Coverage Δ
end_to_end	98.03% <ø> (-0.05%)	:arrow_down:
unit	48.85% <ø> (+0.05%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pytask_latex/collect.py	99.00% <ø> (-0.02%)	:arrow_down:
tests/test_collect.py	100.00% <ø> (ø)
tests/test_execute.py	100.00% <ø> (ø)

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