Update release notes for 1.14.8 to reflect AWS bugfix

[flands]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design

/kind documentation

/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Release notes did not capture a critical bugfix

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[liggitt]

/lgtm
/approve
/ok-to-test
/priority backlog

[liggitt]

/sig cloud-provider

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[APPROVALNOTIFIER] This PR is APPROVED

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