Update the copyright year in knative website

[Leo6Leo]

Describe the change you'd like to see
Update the year in the knative website. Currently it is Copyright © 2022 The Knative Authors

Additional context
Add any other context or screenshots about the feature request here.

/good-first-issue
/help-wanted

[knative-prow]

@Leo6Leo:
This request has been marked as suitable for new contributors.

Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed
by commenting with the /remove-good-first-issue command.

In response to this:

Describe the change you'd like to see
Update the year in the knative website. Currently it is Copyright © 2022 The Knative Authors

Additional context
Add any other context or screenshots about the feature request here.

/good-first-issue
/help-wanted

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[professorabhay]

Hey, @Leo6Leo! I would like to resolve it!

[Leo6Leo]

/assign @professorabhay