Update go-version

[michel-laterman]

What does this PR do?

Update go version to 1.16.5

• Relates Update to golang 1.16.5/1.15.13 beats#26182

[elasticmachine]

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Build stats

• Build Cause: Pull request #436 updated

• Start Time: 2021-06-09T16:14:13.948+0000

• Duration: 5 min 15 sec

• Commit: 0295c61

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Test	Results
Failed	0
Passed	178
Skipped	0
Total	178

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[michel-laterman]

/test

[urso]

Looks like the go.mod is incomplete?

[michel-laterman]

I'm not really sure what's going on, I can recreate the issue locally but the steps that go says to take to resolve the issue (go mod download github.com/elastic/go-licenser go.elastic.co/go-licence-detector) do not fix it

[urso]

The recent problem was introduced with introducing go get .... When doing go get you update the dependency you get. In that case the go-licenser was updated. go get is run in the current working directory, which is contains the fleet-server source. This motivates the go tool to update your dependencies unfortunately. This might update go.sum and go.mod as well. The newer go-licenser version also changes the format it seems, resulting in the huge diff on the notice file.