Revert "gha: temporarily disable codecov"

[lukaszstolarczuk]

This reverts commit 7a41d10.

It should be working now.

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This change is 

[codecov]

Codecov Report

Merging #1085 (01a33e6) into master (cfde2f4) will increase coverage by 0.27%.
The diff coverage is 99.20%.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
+ Coverage   93.99%   94.26%   +0.27%     
==========================================
  Files          49       51       +2     
  Lines        4726     4971     +245     
==========================================
+ Hits         4442     4686     +244     
- Misses        284      285       +1     

Flag	Coverage Δ
tests_clang_debug_cpp17	93.79% <99.18%> (+0.32%)	⬆️
tests_gcc_debug	91.98% <96.24%> (+0.63%)	⬆️

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Impacted Files	Coverage Δ
include/libpmemobj++/detail/life.hpp	97.22% <ø> (-0.78%)	⬇️
include/libpmemobj++/detail/ringbuf.hpp	98.38% <98.38%> (ø)
include/libpmemobj++/experimental/mpsc_queue.hpp	100.00% <100.00%> (ø)
include/libpmemobj++/experimental/radix_tree.hpp	99.46% <100.00%> (+0.05%)	⬆️
include/libpmemobj++/utils.hpp	88.88% <0.00%> (-11.12%)	⬇️
include/libpmemobj++/transaction.hpp	79.83% <0.00%> (-0.81%)	⬇️
...ude/libpmemobj++/container/concurrent_hash_map.hpp	94.35% <0.00%> (-0.16%)	⬇️
include/libpmemobj++/detail/tagged_ptr.hpp	100.00% <0.00%> (ø)
... and 5 more

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