chore: fix repository url for npm package

[wellwelwel]

Just fixing a warning from npm when publishing:

npm warn publish npm auto-corrected some errors in your package.json when publishing.  Please run "npm pkg fix" to address these errors.
npm warn publish errors corrected:
npm warn publish "repository.url" was normalized to "git+https://github.com/sidorares/node-mysql2.git"

• Not related to chore(master): release 3.13.0 #3377 (comment).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (5703c65) to head (81ae679).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3378   +/-   ##
=======================================
  Coverage   88.70%   88.70%           
=======================================
  Files          85       85           
  Lines       13446    13446           
  Branches     1531     1531           
=======================================
  Hits        11927    11927           
  Misses       1519     1519           

Flag	Coverage Δ
compression-0	88.70% <ø> (ø)
compression-1	88.70% <ø> (ø)
static-parser-0	86.28% <ø> (ø)
static-parser-1	87.09% <ø> (ø)
tls-0	88.11% <ø> (ø)
tls-1	88.47% <ø> (ø)

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