Update spring core to v5.3.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.springframework:spring-aop	5.3.14 -> 5.3.15
org.springframework:spring-tx	5.3.14 -> 5.3.15

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Release Notes

spring-projects/spring-framework

v5.3.15

⭐ New Features

• PrintingResultHandler in MockMvc should infer UTF-8 encoding for JSON response #​27926
• WebFlux request id should not contain internal IPs #​27885
• Deprecate inappropriate getBeanFactory() method in AbstractBeanDefinitionReader #​27875
• Make H2SequenceMaxValueIncrementer compatible with H2 database 2.0.x #​27870
• Improve error message in ResolvableType.forClassWithGenerics() #​27847
• Use of RequestPart with String leads to a file descriptor leak #​27773
• Expose headers from native client request after request is committed #​27768

🐞 Bug Fixes

• Cannot read server-sent events without data (a.k.a. heartbeats) #​27923
• ArrayIndexOutOfBoundsException with STOMP and Jetty 10 #​27899
• ServerHttpResponseDecorator does not delegate methods for raw status code #​27889
• Clear cache when clearing argument resolvers #​27888
• Duplicated content-type response header on error response #​27887

📔 Documentation

• Fix syntax in WebFlux Validation example #​27907
• Add Section on Authorization to STOMP WebSocket documentation #​27906
• Correct not compiling example code in Data Access docs #​27886

🔨 Dependency Upgrades

• Upgrade to Reactor 2020.0.15 #​27897

❤️ Contributors

We'd like to thank all the contributors who worked on this release!

• @​izeye
• @​justlikeliuen
• @​waahhh
• @​kth496
• @​sokomishalov
• @​hpoettker
• @​wengertj
• @​figroc
• @​springmonster
• @​demkom58

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