chore: release 0.31

[rainest]

Upgrades Go since we've been doing it for other projects.

Makes @achoimet's contribution from #192 available in a tag.

[codecov-commenter]

Codecov Report

Merging #197 (2b9c0fa) into main (6393f07) will decrease coverage by 13.58%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #197       +/-   ##
===========================================
- Coverage   53.36%   39.78%   -13.59%     
===========================================
  Files          44       44               
  Lines        3924     3924               
===========================================
- Hits         2094     1561      -533     
- Misses       1367     2067      +700     
+ Partials      463      296      -167     

Flag	Coverage Δ
2.0.5	39.78% <ø> (ø)
2.1.4	39.62% <ø> (ø)
2.2.2	?
2.3.3	39.62% <ø> (ø)
2.4.0	?
2.5.1	?
2.6.0	?
2.7.0	?
2.8.0	?
community	39.78% <ø> (ø)
enterprise	?
enterprise-1.5.0.11	?
enterprise-2.1.4.6	?
enterprise-2.2.1.3	?
enterprise-2.3.3.4	?
enterprise-2.4.1.3	?
enterprise-2.5.1.2	?
enterprise-2.6.0.2	?
enterprise-2.7.0.0	?
enterprise-2.8.0.0	?
integration	39.78% <ø> (-13.59%)	⬇️

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

Impacted Files	Coverage Δ
kong/mtls_auth_service.go	0.00% <0.00%> (-62.50%)	⬇️
kong/developer_service.go	0.00% <0.00%> (-54.87%)	⬇️
kong/workspace_service.go	0.00% <0.00%> (-51.21%)	⬇️
kong/rbac_role_service.go	0.00% <0.00%> (-48.94%)	⬇️
kong/developer_role_service.go	0.00% <0.00%> (-46.67%)	⬇️
kong/entity_permission_service.go	0.00% <0.00%> (-40.66%)	⬇️
kong/rbac_user_service.go	0.00% <0.00%> (-34.89%)	⬇️
kong/types.go	7.04% <0.00%> (-30.99%)	⬇️
kong/endpoint_permission_service.go	0.00% <0.00%> (-26.42%)	⬇️
kong/exists.go	50.00% <0.00%> (-25.00%)	⬇️
... and 3 more

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[pmalek]

Ideally we'd release in a separate PR but 🤷

👍