Update golang Docker tag to v1.19

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
golang	minor	1.18-buster -> 1.19-buster

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[codecov[bot]]

Codecov Report

Merging #127 (208d73b) into master (e7a909d) will increase coverage by 0.30%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   41.81%   42.11%   +0.30%     
==========================================
  Files          32       32              
  Lines        1325     1325              
==========================================
+ Hits          554      558       +4     
+ Misses        737      732       -5     
- Partials       34       35       +1     

Impacted Files	Coverage Δ
internal/tpl/render.go	75.18% <0.00%> (+3.00%)	:arrow_up:

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