chore: drop go 1.16 support

[ubogdan]

Describe the PR
drop go1.16 support due to golang.org/x/net security issues.

Relation issue
None

Additional context
None

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e3a0e42) 100.00% compared to head (6d4a239) 100.00%.

❗ Current head 6d4a239 differs from pull request most recent head 48e3d9b. Consider uploading reports for the commit 48e3d9b to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #103   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           82        76    -6     
=========================================
- Hits            82        76    -6     

Impacted Files	Coverage Δ
swagger.go	100.00% <100.00%> (ø)

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