Spring Security Update jacoco tool version to 0.8.9

When working with Java 21, jacoco cannot analyze bytecode from prior versions. Upgrading the jacoco tool version to 0.8.9 adds experimental support for this via jacoco/jacoco#1386.

While upgrading to 0.8.9, OAuth2AuthenticationExceptionMixinTests fail due to gh-11893 because Jacoco no longer adds --add-opens. See jacoco/jacoco#1328.