Bump version of golang used for testing

[waciumawanjohi]

Testing (running go test ./...) with go 1.18 fails with message

# github.com/go-git/go-git/v5/utils/trace
../../../go/pkg/mod/github.com/go-git/go-git/[email protected]/utils/trace/trace.go:15:17: undefined: atomic.Int32
note: module requires Go 1.19

Testing with go 1.21 or 1.22 fails with the message:

go: updates to go.mod needed; to update it:
	go mod tidy

Running go mod tidy -go=1.19 yields:

go: k8s.io/[email protected] requires [email protected], but 1.19 is requested

Running go mod tidy without specifying the version bumps the go version and go toolchain version. Running make lint after this causes a panic.

This PR simply bumps the go version for running tests to 1.20 to enable unrelated changes to be merged.

[jenkins-x-bot]

Hi @waciumawanjohi. Thanks for your PR.

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[garethjevans]

/ok-to-test

[msvticket]

/retest

[garethjevans]

/lgtm

[jenkins-x-bot]

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