[Tech Debt] Update flink version after 1.20.5 & 2.1.3 release. #692

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Description

In flink-agents, cross-language interaction between Python and Java relies on the pemja framework. Before pemja 0.5.7, errors or JVM crashes could occur when flink-agents performed cross-language interaction from an asynchronous thread. This issue was fixed in pemja 0.5.7: alibaba/pemja#95.
Since flink-agents depends on pemja transitively through PyFlink, adopting pemja 0.5.7 in flink-agents requires the following steps:

1. Bump the pemja version used by Flink.
2. Release a Flink version that includes this bump.
3. Update the Flink version that flink-agents depends on.

Status:

• Step 1 has been completed on Flink's 1.20, 2.x, and master branches:
  • 1.20: [FLINK-39534][python] Bump pemja to 0.5.7 flink#28019
  • 2.0: [FLINK-39534][python] Bump pemja to 0.5.7 flink#28017
  • 2.1: [FLINK-39534][python] Bump pemja to 0.5.7 flink#28018
  • 2.2, 2.3, and master: [FLINK-39534][python] Bump pemja to 0.5.7 flink#28016
• Step 2: Flink 2.0.2 and 2.2.1 already include this bump, but no patch release containing the bump has been published yet for 1.20 or 2.1.
• Step 3: The Flink patch version referenced under the dist directory has been updated accordingly.

The remaining tasks are:

1. Release versions 1.20 and 2.1 that include the pemja upgrade.

2. Update the minor Flink version dependency in dist.

Are you willing to submit a PR?

• I'm willing to submit a PR!