deps: remove codecov.io

[elharo]

@vam-google

[codecov]

Codecov Report

Merging #1354 (c62d923) into master (52e39f8) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head c62d923 differs from pull request most recent head 698ee17. Consider uploading reports for the commit 698ee17 to get more accurate results

@@             Coverage Diff              @@
##             master    #1354      +/-   ##
============================================
- Coverage     81.46%   81.43%   -0.04%     
+ Complexity     1347     1346       -1     
============================================
  Files           211      211              
  Lines          5730     5730              
  Branches        525      525              
============================================
- Hits           4668     4666       -2     
- Misses          850      851       +1     
- Partials        212      213       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../google/api/gax/batching/NonBlockingSemaphore.java	76.31% <0.00%> (-5.27%)	11.00% <0.00%> (-1.00%)

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