Merge branch 'spring-5.2' into 'master'

Upgrade Maven dependencies for Spring 5.2

See merge request arsnova/arsnova-backend!191
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failed #176110
checkstyle

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checkstyle_javadoc

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compile

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checkstyle

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checkstyle_javadoc

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compile

 
  Post Build
skipped #170751
package
skipped #170750
unit_test
 
  Deploy
skipped #170753
allowed to fail
sonarqube
skipped #170752
allowed to fail manual
tomcat_development
 
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