Bump springdoc.version from 2.6.0 to 2.8.4

Bumps `springdoc.version` from 2.6.0 to 2.8.4.

Updates `org.springdoc:springdoc-openapi-starter-common` from 2.6.0 to 2.8.4
- [Release notes](https://github.com/springdoc/springdoc-openapi/releases)
- [Changelog](https://github.com/springdoc/springdoc-openapi/blob/main/CHANGELOG.md)
- [Commits](springdoc/springdoc-openapi@v2.6.0...v2.8.4)

Updates `org.springdoc:springdoc-openapi-starter-webmvc-ui` from 2.6.0 to 2.8.4
- [Release notes](https://github.com/springdoc/springdoc-openapi/releases)
- [Changelog](https://github.com/springdoc/springdoc-openapi/blob/main/CHANGELOG.md)
- [Commits](springdoc/springdoc-openapi@v2.6.0...v2.8.4)

---
updated-dependencies:
- dependency-name: org.springdoc:springdoc-openapi-starter-common
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.springdoc:springdoc-openapi-starter-webmvc-ui
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -35,7 +35,7 @@
         <wiremock.version>3.10.0</wiremock.version>
         <token-validation-spring.version>5.0.16</token-validation-spring.version>
         <nav-foedselsnummer.version>1.0-SNAPSHOT.6</nav-foedselsnummer.version>
-        <springdoc.version>2.6.0</springdoc.version>
+        <springdoc.version>2.8.4</springdoc.version>
         <sentry.version>8.0.0</sentry.version>
         <kotlinx.version>1.10.1</kotlinx.version>