Fix broken links in reference documentation

[christophstrobl]

404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/data-access.html#jdbc
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/core.html
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/core.html#beans
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/core.html#validation
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/core.html#expressions
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/core.html#aop
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/integration.html#jmx
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/data-access.html
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/data-access.html#dao-exceptions
404 NOT_FOUND: https://docs.spring.io/spring/docs/6.0.0/spring-framework-reference/
404 NOT_FOUND: https://www.datastax.com/dev/blog
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmldata-access.html#dao-exceptions
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmlcore.html#core-convert
404 NOT_FOUND: https://spring.io/tools/sts
404 NOT_FOUND: https://repo.spring.io/webapp/#/home
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmlcore.html#beans-java-instantiating-container
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmldata-access.html
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmlhtml/dao.html#dao-exceptions
404 NOT_FOUND: https://docs.spring.io/spring-framework/docs/6.0.0/reference/htmlweb.html#web-reactive
404 NOT_FOUND: http://www.springframework.org/schema/cql
404 NOT_FOUND: https://www.springframework.org/schema/cql/spring-cql.xsd
410 GONE: https://bintray.com/bintray/jcenter/org.jetbrains.kotlin%3Akotlin-stdlib
410 GONE: https://bintray.com/bintray/jcenter/org.jetbrains.kotlin%3Akotlin-stdlib-jdk8
410 GONE: https://bintray.com/bintray/jcenter/org.jetbrains.kotlin%3Akotlin-reflect