Upgrade to Golang-1.18

[tnasu]

Description

Upgrade to Golang-1.18 since the current version of Golang-1.15 is so old and already out of support.

• https://endoflife.date/go
• https://go.dev/doc/devel/release

And super linter suddenly failed. I modified to the default behaviour of super linter.

• https://github.com/github/super-linter#example-connecting-github-action-workflow
• https://github.com/github/super-linter#environment-variables
  • Modify to a repo from a docker image
  • Remove the same default settings
  • Rename to depend on the default directory/file name structures

[codecov]

Codecov Report

Merging #450 (5202f36) into main (2231684) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
+ Coverage   65.46%   65.51%   +0.04%     
==========================================
  Files         278      278              
  Lines       37920    37920              
==========================================
+ Hits        24824    24842      +18     
+ Misses      11286    11265      -21     
- Partials     1810     1813       +3     

Impacted Files	Coverage Δ
consensus/reactor.go	74.84% <0.00%> (-0.71%)	⬇️
consensus/state.go	73.32% <0.00%> (-0.24%)	⬇️
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
p2p/conn/connection.go	80.00% <0.00%> (+0.19%)	⬆️
p2p/switch.go	66.52% <0.00%> (+0.61%)	⬆️
types/tx.go	93.90% <0.00%> (+3.65%)	⬆️
blockchain/v0/pool.go	83.72% <0.00%> (+5.94%)	⬆️

[torao]

LGTM