Remove com.spotify:dns

[klaraward]

Since no org.xbill or com.spotify.dns packages are used

[codecov]

Codecov Report

Merging #360 (b2d3fcb) into 1.x (dcd1c25) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                1.x     #360   +/-   ##
=========================================
  Coverage     72.14%   72.14%           
  Complexity      676      676           
=========================================
  Files           137      137           
  Lines          2868     2868           
  Branches        169      169           
=========================================
  Hits           2069     2069           
  Misses          761      761           
  Partials         38       38           

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