Fix outdated shibboleth repo

[strehle]

We had until last week opensaml 4.0.1 which is also in maven central available.
Now we the update we require shibboleth repos and obviously we had an outdated version in use

fix

Execution failed for task ':cloudfoundry-identity-server:compileJava'.

Could not resolve all files for configuration ':cloudfoundry-identity-server:compileClasspath'.
Could not find org.opensaml:opensaml-saml-api:4.3.2.
Required by:
project ':cloudfoundry-identity-server'
project ':cloudfoundry-identity-server' > org.springframework.security:spring-security-saml2-service-provider:6.5.9
Could not find org.opensaml:opensaml-saml-impl:4.3.2.
Required by:
project ':cloudfoundry-identity-server' > org.springframework.security:spring-security-saml2-service-provider:6.5.9

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