Update spring core to v5.3.39

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.springframework:spring-test	5.3.37 -> 5.3.39
org.springframework:spring-context	5.3.37 -> 5.3.39

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Release Notes

spring-projects/spring-framework (org.springframework:spring-test)

v5.3.39

v5.3.38

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