Update dependency no.nav.security:mock-oauth2-server to v2

Author: renovate[bot]

sigstore-java/build.gradle.kts

@@ -51,7 +51,7 @@ dependencies {
     testImplementation("org.mockito:mockito-core")
     testImplementation("org.mockito:mockito-junit-jupiter")
 
-    testImplementation("no.nav.security:mock-oauth2-server:0.5.10")
+    testImplementation("no.nav.security:mock-oauth2-server:2.1.6")
     testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
     testImplementation("net.sourceforge.htmlunit:htmlunit:2.70.0")
     testImplementation("org.eclipse.jetty:jetty-server:11.0.21")