[FIX] use absolute paths in codecov

[eseiler]

The wild coverage change is due to https://docs.codecov.io/docs/fixing-reports now working,

coverage is now not reported for lines like

{

, i.e., lines only containing a single symbol from {}().

we apparently had 614 such occurrences.
One of them was apparently a miss.
So we "lost" 613 hits and 1 miss.

All in all that means that our coverage did not decrease, because we did not gain any misses.
But from a relative POV, we had (10867 - 188) / 10867 = 0.9827 coverage before, but now only have (10254 - 187) / 10254 = 0.9817 coverage.
See also: https://docs.codecov.io/docs/coverage-offset

TLDR; the coverage dropped because our coverage code base shrunk.

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[codecov]

Codecov Report

Merging #2496 (6db646e) into master (a1dd8cd) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2496      +/-   ##
==========================================
- Coverage   98.29%   98.20%   -0.10%     
==========================================
  Files         268      268              
  Lines       11055    10441     -614     
==========================================
- Hits        10867    10254     -613     
+ Misses        188      187       -1     

Impacted Files	Coverage Δ
...an3/alignment/scoring/aminoacid_scoring_scheme.hpp	88.23% <0.00%> (-1.77%)	⬇️
...nment/pairwise/policy/simd_find_optimum_policy.hpp	79.41% <0.00%> (-1.11%)	⬇️
include/seqan3/core/detail/debug_stream_type.hpp	76.00% <0.00%> (-0.93%)	⬇️
include/seqan3/argument_parser/validators.hpp	91.39% <0.00%> (-0.91%)	⬇️
include/seqan3/utility/parallel/detail/latch.hpp	96.00% <0.00%> (-0.78%)	⬇️
.../utility/parallel/detail/reader_writer_manager.hpp	96.29% <0.00%> (-0.77%)	⬇️
...lude/seqan3/argument_parser/detail/format_html.hpp	92.40% <0.00%> (-0.70%)	⬇️
...lude/seqan3/argument_parser/detail/format_base.hpp	91.44% <0.00%> (-0.68%)	⬇️
...ignment/pairwise/detail/policy_optimum_tracker.hpp	97.29% <0.00%> (-0.53%)	⬇️
...lude/seqan3/argument_parser/detail/format_help.hpp	88.69% <0.00%> (-0.52%)	⬇️
... and 126 more

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[eaasna]

Nice work!