Update releases for v0.42.0

[pritidesai]

Changes

Update the releases file for v0.42.0 with end of life set to four months from the release date.
Release v0.38.x is EOL so moving it to the EOL releases.

/kind documentation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
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Release Notes

Update releases file for v0.42.0

[afrittoli]

Thank you!!
/approve

[vdemeester]

/lgtm

[tekton-robot]

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