Update dependency no.nav.security:mock-oauth2-server to v0.5.7

Author: renovate[bot]

sigstore-java/build.gradle.kts

@@ -42,7 +42,7 @@ dependencies {
     testImplementation("org.junit.jupiter:junit-jupiter")
 
     testImplementation("org.mockito:mockito-core:4.9.0")
-    testImplementation("no.nav.security:mock-oauth2-server:0.5.6")
+    testImplementation("no.nav.security:mock-oauth2-server:0.5.7")
     testImplementation("com.squareup.okhttp3:mockwebserver:4.10.0")
     testImplementation("net.sourceforge.htmlunit:htmlunit:2.67.0")
     testImplementation("org.eclipse.jetty:jetty-server:11.0.13")