Update dependency io.jsonwebtoken:jjwt to v0.12.6

Author: renovate[bot]

build.gradle

@@ -376,7 +376,7 @@ dependencies {
   testImplementation group: 'net.serenity-bdd', name: 'serenity-junit', version: '3.8.1'
   implementation group: 'com.sun.xml.bind', name: 'jaxb-osgi', version: '2.3.9'
   implementation group: 'com.github.hmcts', name: 'service-auth-provider-java-client', version: versions.reformS2sClient
-  implementation group: 'io.jsonwebtoken', name: 'jjwt', version:'0.9.1'
+  implementation group: 'io.jsonwebtoken', name: 'jjwt', version:'0.12.6'
   implementation group: 'com.auth0', name: 'java-jwt', version: '4.4.0'
   implementation group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310'
   implementation group: 'com.fasterxml.jackson.core', name: 'jackson-core'