fix(service): use Connection header on HTTP requests

[JosephKav]

A significant difference between HTTP/1.1 and earlier versions of HTTP is that persistent connections are the default behavior of any HTTP connection.

Inform the server that the client wants to close the connection after the transaction is complete. This can be done by setting the Connection header
source

fix?

[codecov]

Codecov Report

Merging #156 (3ed5669) into master (6c8e559) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   97.64%   97.64%   +0.01%     
==========================================
  Files          63       63              
  Lines        5241     5248       +7     
==========================================
+ Hits         5117     5124       +7     
  Misses         89       89              
  Partials       35       35              

Impacted Files	Coverage Δ
service/deployed_version/deployed_version.go	100.00% <100.00%> (ø)
service/latest_version/filters/docker.go	92.31% <100.00%> (+0.04%)	⬆️
service/latest_version/query.go	98.14% <100.00%> (ø)
web/api/v1/http.go	100.00% <100.00%> (ø)
web/web.go	92.50% <100.00%> (+0.40%)	⬆️
webhook/init.go	100.00% <100.00%> (ø)

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