go: Bump Go to 1.14.3

[kostko]

Fixes #2913

[codecov]

Codecov Report

Merging #2954 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2954      +/-   ##
==========================================
- Coverage   68.51%   68.38%   -0.13%     
==========================================
  Files         361      361              
  Lines       35131    35131              
==========================================
- Hits        24070    24026      -44     
- Misses       7984     8002      +18     
- Partials     3077     3103      +26     

Impacted Files	Coverage Δ
go/storage/metrics.go	78.26% <0.00%> (-9.79%)	⬇️
go/storage/api/root_cache.go	70.11% <0.00%> (-4.60%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0.00%> (-4.35%)	⬇️
go/storage/mkvs/tree.go	89.28% <0.00%> (-3.58%)	⬇️
go/storage/database/database.go	70.58% <0.00%> (-3.37%)	⬇️
go/storage/mkvs/insert.go	87.75% <0.00%> (-2.73%)	⬇️
go/worker/common/p2p/p2p.go	61.71% <0.00%> (-2.71%)	⬇️
go/worker/compute/merge/committee/node.go	75.87% <0.00%> (-2.49%)	⬇️
go/runtime/transaction/transaction.go	75.75% <0.00%> (-2.43%)	⬇️
go/worker/compute/txnscheduler/committee/node.go	62.07% <0.00%> (-2.15%)	⬇️
... and 25 more

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