Found no existing warnings by running ./gradlew --no-build-cache clean :spring-security-cas:javadoc

Closes spring-projectsgh-18447

Signed-off-by: Michael Lück <git@lueckonline.net>

rwinch changed the title fail build on javadoc warnings. spring-security-cas fail build on javadoc warnings

rwinch changed the title spring-security-cas fail build on javadoc warnings Fail spring-security-cas on javadoc warnings

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