Bump nimbus-jose-jwt from 9.15.2 to 9.20 (#80)

Bumps [nimbus-jose-jwt](https://bitbucket.org/connect2id/nimbus-jose-jwt) from 9.15.2 to 9.20.
- [Changelog](https://bitbucket.org/connect2id/nimbus-jose-jwt/src/master/CHANGELOG.txt)
- [Commits](https://bitbucket.org/connect2id/nimbus-jose-jwt/branches/compare/9.20..9.15.2)

---
updated-dependencies:
- dependency-name: com.nimbusds:nimbus-jose-jwt
  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>

adapter-sdk-kotlin/build.gradle.kts

@@ -17,7 +17,7 @@ description = "Oslonøkkelen Adapter Kotlin SDK"
 dependencies {
     implementation("org.slf4j:slf4j-api:1.7.36")
     api(project(":adapter-protobuf-java"))
-    api("com.nimbusds:nimbus-jose-jwt:9.15.2")
+    api("com.nimbusds:nimbus-jose-jwt:9.20")
     api("org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.4")
 
     testImplementation("org.slf4j:slf4j-simple:1.7.32")