Bump springdocVersion from 2.5.0 to 2.6.0 (#489)

Bumps `springdocVersion` from 2.5.0 to 2.6.0.

Updates `org.springdoc:springdoc-openapi-starter-common` from 2.5.0 to 2.6.0
- [Release notes](https://github.com/springdoc/springdoc-openapi/releases)
- [Changelog](https://github.com/springdoc/springdoc-openapi/blob/main/CHANGELOG.md)
- [Commits](springdoc/springdoc-openapi@v2.5.0...v2.6.0)

Updates `org.springdoc:springdoc-openapi-starter-webmvc-ui` from 2.5.0 to 2.6.0
- [Release notes](https://github.com/springdoc/springdoc-openapi/releases)
- [Changelog](https://github.com/springdoc/springdoc-openapi/blob/main/CHANGELOG.md)
- [Commits](springdoc/springdoc-openapi@v2.5.0...v2.6.0)

---
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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle.kts

@@ -62,7 +62,7 @@ dependencies {
 
     val mockkVersion = "1.13.12"
     val tokenValidationVersion = "5.0.1"
-    val springdocVersion = "2.5.0"
+    val springdocVersion = "2.6.0"
     val navFoedselsnummerVersion = "1.0-SNAPSHOT.6"
     val skattKontraktVersjon = "2.0_20230214104704_706e9c0"
     val fellesVersjon = "3.20240715145751_fc025c1"