fix: properly flush and sync all writers

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (f4f01b1) 73.90% compared to head (9c1658d) 73.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
- Coverage   73.90%   73.76%   -0.15%     
==========================================
  Files          21       21              
  Lines        4472     4497      +25     
==========================================
+ Hits         3305     3317      +12     
- Misses       1167     1180      +13     

Files	Coverage Δ
src/common/io/std.rs	95.00% <0.00%> (-5.00%)	⬇️
src/annotate/seqvars/mod.rs	69.53% <54.54%> (-0.22%)	⬇️
src/annotate/strucvars/mod.rs	86.64% <54.54%> (-0.23%)	⬇️

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