Add v0.44.0 to the releases doc

[AlanGreene]

Changes

/kind documentation

Submitter Checklist

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

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• Tests included if any functionality added or changed
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Release Notes

NONE

[tekton-robot]

@AlanGreene: The label(s) kind/dcumentation cannot be applied, because the repository doesn't have them.

In response to this:

Changes

/kind dcumentation

Submitter Checklist

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

• Docs included if any changes are user facing
• Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user facing changes (new features, significant UI changes, API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

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[AlanGreene]

/kind documentation

[briangleeson]

/lgtm

[tekton-robot]

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