[FLINK-24858][release][docs] Recommend users to upgrade to 1.14.3 fro…

[fapaul]

…m 1.13.x to use state serializer fix

Unchanged port of #18378

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Last check on commit a9176c3 (Mon Jan 17 10:06:19 UTC 2022)

Warnings:

• Documentation files were touched, but no docs/content.zh/ files: Update Chinese documentation or file Jira ticket.

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CI report:

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[twalthr]

LGTM

[fapaul]

Failures are unrelated and are not caused by the docs changes.