ci: add govulncheck

[imjasonh]

https://github.com/golang/govulncheck-action

govulncheck ./...        
govulncheck is an experimental tool. Share feedback at https://go.dev/s/govulncheck-feedback.

Using go1.20.7
 and [email protected] with vulnerability data from https://vuln.go.dev (last modified 2023-08-02 20:33:39 +0000 UTC).

Scanning your code and 658 packages across 111 dependent modules for known vulnerabilities...

(no vulns 😎)

[codecov-commenter]

Codecov Report

Merging #1110 (7c8a258) into main (83589fd) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main    #1110   +/-   ##
=======================================
  Coverage   49.19%   49.19%           
=======================================
  Files          44       44           
  Lines        3653     3653           
=======================================
  Hits         1797     1797           
  Misses       1624     1624           
  Partials      232      232