Update changelog about upgrade to spring-boot-dependencies:2.4.5 and spring-cloud-dependencies:2020.0.2

[chenrujun]

Update changelog about upgrade to spring-boot-dependencies:2.4.5 and spring-cloud-dependencies:2020.0.2

[chenrujun]

Related PR: #20721

[chenrujun]

Hi, @saragluna , @yiliuTo , please help to review this PR. 🙏

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[saragluna]

LGTM.