build(deps): bump org.opensaml:opensaml-saml-api from 4.0.1 to 5.1.5

Bumps org.opensaml:opensaml-saml-api from 4.0.1 to 5.1.5.

---
updated-dependencies:
- dependency-name: org.opensaml:opensaml-saml-api
  dependency-version: 5.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

dependencies.gradle

@@ -16,7 +16,7 @@ versions.guavaVersion = "33.4.8-jre"
 versions.seleniumVersion = "4.35.0"
 versions.braveVersion = "6.3.0"
 versions.jacksonVersion = "2.19.2"
-versions.opensaml = "4.0.1"
+versions.opensaml = "5.1.5"
 versions.byteBuddyVersion = "1.17.7"
 
 // Versions we're overriding from the Spring Boot Bom (Dependabot does not issue PRs to bump these versions, so we need to manually bump them)