Check db connection in healthz endpoint in addition to adapter connections

[devth]

No description provided.

[codecov]

Codecov Report

Merging #128 into master will decrease coverage by 0.03%.
The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   42.29%   42.25%   -0.04%     
==========================================
  Files          91       91              
  Lines        3880     3886       +6     
  Branches      168      170       +2     
==========================================
+ Hits         1641     1642       +1     
- Misses       2071     2074       +3     
- Partials      168      170       +2     

Impacted Files	Coverage Δ
src/yetibot/core/webapp/routes/healthz.clj	22.22% <10.00%> (-6.35%)	⬇️
src/yetibot/core/db.clj	78.08% <66.66%> (-0.80%)	⬇️

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