[build] Update check_go_version

[huitseeker]

• we support go 1.15+
• go 1.17 is out

[codecov-commenter]

Codecov Report

Merging #1212 (c6b76bc) into master (8c02466) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1212   +/-   ##
=======================================
  Coverage   55.81%   55.81%           
=======================================
  Files         484      484           
  Lines       29769    29769           
=======================================
+ Hits        16615    16617    +2     
+ Misses      10890    10886    -4     
- Partials     2264     2266    +2     

Flag	Coverage Δ
unittests	55.81% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/util/ledger/migrations/storage_v4.go	41.56% <0.00%> (-0.61%)	⬇️
...sus/approvals/assignment_collector_statemachine.go	50.00% <0.00%> (+2.88%)	⬆️

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[m4ksio]

up to 9?

[huitseeker]

i.e. we shouldn't have to revisit this upper bound until Feb 2023

[huitseeker]

bors merge

[bors]

Build succeeded:

• Integration Tests (1.15)
• Integration Tests (1.16)
• Lint
• Unit Tests (1.15)
• Unit Tests (1.16)