[jira] [Created] (FLINK-22432) Update upgrading.md with 1.13.x

[Shang Yuanchun (Jira)]

Dawid Wysakowicz created FLINK-22432:
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             Summary: Update upgrading.md with 1.13.x
                 Key: FLINK-22432
                 URL: https://issues.apache.org/jira/browse/FLINK-22432
             Project: Flink
          Issue Type: New Feature
          Components: Documentation
            Reporter: Dawid Wysakowicz
            Assignee: Dawid Wysakowicz
             Fix For: 1.13.0






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