[triggers/pkg] clean up ioutil for new go version

[my-git9]

Changes

Clean up ioutil for new go version in dirctory triggers/pkg
Ref: #1495

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Release Notes

[tekton-robot]

Hi @my-git9. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dibyom]

/ok-to-test

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/interceptors/server/server.go	78.9%	79.3%	0.3

[my-git9]

/test pull-tekton-triggers-integration-tests

[khrm]

/test pull-tekton-triggers-integration-tests

[khrm]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: khrm

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• OWNERS [khrm]

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[tekton-robot]

@my-git9: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-triggers-build-tests	1c3ee74	link	unknown	/test pull-tekton-triggers-build-tests

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[khrm]

I have merged this pr to my pr: #1534