Update codecov.yml to codecov/codecov-action@v2.

[zackw]

codecov-action@v1 is deprecated due to its inextricable coupling with Codecov’s shell-script uploader, which is also deprecated, due to its being an unmaintainable pile of shell script. See https://github.com/codecov/codecov-action/blob/635d4e88ad8c1f75b56277efd9ec186c3359727f/README.md#%EF%B8%8F--deprecration-of-v1 [sic] and https://about.codecov.io/blog/introducing-codecovs-new-uploader/ for gory details.

The new uploader does not support the ‘gcov_executable‘ and ‘gcov_path_exclude‘ parameters yet, so for the time being we go back to preprocessing the coverage data with lcov (as we were doing on Travis).

[codecov[bot]]

Codecov Report

Merging #136 (41886a8) into develop (b321602) will decrease coverage by 1.31%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #136      +/-   ##
===========================================
- Coverage    89.86%   88.55%   -1.32%     
===========================================
  Files           33       32       -1     
  Lines         3413     3607     +194     
  Branches         0      684     +684     
===========================================
+ Hits          3067     3194     +127     
+ Misses         346      228     -118     
- Partials         0      185     +185     

Impacted Files	Coverage Δ
lib/crypt-gost-yescrypt.c	69.84% <0.00%> (-12.13%)	:arrow_down:
lib/alg-yescrypt-common.c	69.14% <0.00%> (-11.84%)	:arrow_down:
lib/crypt-yescrypt.c	76.74% <0.00%> (-10.76%)	:arrow_down:
lib/crypt-scrypt.c	72.07% <0.00%> (-10.41%)	:arrow_down:
lib/alg-yescrypt-platform.c	83.78% <0.00%> (-9.97%)	:arrow_down:
lib/util-get-random-bytes.c	82.85% <0.00%> (-7.15%)	:arrow_down:
lib/crypt-des.c	80.71% <0.00%> (-6.66%)	:arrow_down:
lib/util-make-failure-token.c	93.75% <0.00%> (-6.25%)	:arrow_down:
lib/alg-yescrypt-opt.c	86.07% <0.00%> (-5.69%)	:arrow_down:
lib/crypt.c	90.07% <0.00%> (-4.84%)	:arrow_down:
... and 20 more

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[zackw]

It appears that this also gets us branch tracking back and that's why the apparent coverage loss.

I would like to merge this ahead of #131 to decouple them.