fix(deps): update dependency org.eclipse.jetty:jetty-server to v12

Author: renovate[bot]

sigstore-java/build.gradle.kts

@@ -54,7 +54,7 @@ dependencies {
     testImplementation("no.nav.security:mock-oauth2-server:0.5.10")
     testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
     testImplementation("net.sourceforge.htmlunit:htmlunit:2.70.0")
-    testImplementation("org.eclipse.jetty:jetty-server:11.0.24")
+    testImplementation("org.eclipse.jetty:jetty-server:12.0.21")
 
     testImplementation("io.github.netmikey.logunit:logunit-core:2.0.0")
     testRuntimeOnly("io.github.netmikey.logunit:logunit-jul:2.0.0")