Replace util.GenerateFixedname with kmeta.ChildName

[odacremolbap]

Fixes #42

Does:

• Replace soon-to-be-deprecated util.GenerateFixedname with kmeta.ChildName
• Update dependencies

References can be found at the linked issue

[knative-prow-robot]

Welcome @odacremolbap! It looks like this is your first PR to knative/sample-source 🎉

[knative-prow-robot]

Hi @odacremolbap. Thanks for your PR.

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[odacremolbap]

/assign @lberk

[tzununbekov]

/ok-to-test

[lberk]

Thanks for the PR!
/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lberk, odacremolbap

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