chore: update go compiler to 1.14.2

[mboersma]

Reason for Change:
Bumps the default compiler to go 1.14.2 and syncs golangci-lint with the local version.

See https://github.com/deis/docker-go-dev/releases/tag/v1.26.2

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:
Previous versions of golangci-lint have caused problems in CI before, so let's watch for that.

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mboersma

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[codecov]

Codecov Report

Merging #2839 into master will not change coverage.
The diff coverage is 93.33%.

@@           Coverage Diff           @@
##           master    #2839   +/-   ##
=======================================
  Coverage   71.05%   71.05%           
=======================================
  Files         147      147           
  Lines       25671    25671           
=======================================
  Hits        18241    18241           
  Misses       6294     6294           
  Partials     1136     1136           

Impacted Files	Coverage Δ
pkg/engine/engine.go	85.79% <83.33%> (ø)
pkg/engine/armvariables.go	86.08% <100.00%> (ø)
pkg/engine/transform/transform.go	72.52% <100.00%> (ø)
pkg/helpers/pki.go	89.03% <100.00%> (ø)

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[mboersma]

I think I have finally gotten the current version of golangci-lint to behave, but given that the previous failures were a bit flaky (and that I can almost never reproduce it locally), let's give this a few more retries in CI.

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mboersma]

/azp run pr-e2e

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mboersma]

Importantly, Go 1.14.2 (as well as 1.13.10) has a fix for the dreaded "PowerRegisterSuspendResumeNotification on Azure App Services" bug for which #2976 was intended as a temporary fix.

[jackfrancis]

/lgtm