Update dependency com.github.hmcts:befta-fw to v20

Author: renovate[bot]

Diff for: build.gradle

@@ -259,7 +259,7 @@ dependencies {
   implementation group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: versions.jackson
   implementation group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: versions.jackson
   implementation group: 'com.launchdarkly', name: 'launchdarkly-java-server-sdk', version: '6.1.0'
-  implementation (group: 'com.github.hmcts', name: 'befta-fw', version: '8.7.11') {
+  implementation (group: 'com.github.hmcts', name: 'befta-fw', version: '20.2.0.rdm.8934.1') {
     exclude group: 'org.apache.commons', module: 'commons-compress'
     exclude group: 'com.google.guava', module: 'guava'
     exclude group: 'org.apache.poi', module: 'poi-ooxml'