Upgrade Golang version to 1.20.6

[chienhanlin]

Summary

This PR bumps Golang version from 1.19.10 to 1.20.6.

Implementation details

1. Update Golang version in

• GO_VERSION
• GO_VERSION_WINDOWS
• BuildRequires: golang >= 1.20.0 in packaging/amazon-linux-ami-integrated/ecs-agent.spec to build ecs-init artifacts with the Golang version >= 1.20.0.

2. Update static check tool in Makefile
Update staticcheck to v0.4.0 to be compatible to Golang 1.20.6. See reference [here].

3. Set CGO_ENABLED=1 in scripts/run-integ-tests.ps1 to run integration test on Windows
As Golang 1.20 now disables cgo by default on systems without a C toolchain, we need explicitly enable it. See Go 1.20 release notes [here] for more details. For reference, we got following errors before setting CGO_ENABLED=1,

At C:\Users\Administrator\AppData\Local\Temp\amazon-ecs-agent\go\src\github.com\aws\amazon-ecs-agent\scripts\run-integ-
tests.ps1:62 char:32
+ ...  = 'debug'; go test -race -tags integration -timeout=40m -v ../agent/ ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (go: -race requi...g CGO_ENABLED=1:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
go : go: -race requires cgo; enable cgo by setting CGO_ENABLED=1
At C:\Users\Administrator\AppData\Local\Temp\amazon-ecs-agent\go\src\github.com\aws\amazon-ecs-agent\scripts\run-integ-
tests.ps1:64 char:34
+ ...  = 'debug'; go test -race -tags integration -timeout=40m -v ../agent/ ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (go: -race requi...g CGO_ENABLED=1:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError

Testing

• Building ecs-init artifacts with Golang 1.20.6 for AL2 and AL2023, both succeeded.
• Static checks for both Linux and Windows pass on this PR
• Functional tests for all supported OS pass on this PR

New tests cover the changes: no

Description for the changelog

Enhancement - Update Agent build golang version to 1.20.6

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[singholt]

Do we also update the version in go.mod files?

https://github.com/aws/amazon-ecs-agent/blob/master/agent/go.mod

https://github.com/aws/amazon-ecs-agent/blob/master/ecs-init/go.mod

https://github.com/aws/amazon-ecs-agent/blob/master/ecs-agent/go.mod