Release/1.6.1

[neolynx]

• update golang-github-syndtr-goleveldb-dev dependency (v1.0.1-0.20220721030215-126854af5e6d) to fix segfault on arm64
• allow snapshotting empty mirrors again (regression)
• debian compliance: add postrm (note: apt purge aptly-api will remove all data in ~aptly-api/)
• update other dependencies (x/net 0.33.0, gin-gonic/gin 1.9.1)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.03%. Comparing base (cf3841e) to head (9397d8a).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1430   +/-   ##
=======================================
  Coverage   75.03%   75.03%           
=======================================
  Files         158      158           
  Lines       18356    18356           
=======================================
  Hits        13773    13773           
  Misses       3445     3445           
  Partials     1138     1138           

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