Update dependency com.launchdarkly:launchdarkly-java-server-sdk to v7

Author: renovate[bot]

build.gradle

@@ -41,7 +41,7 @@ def versions = [
         sonarPitest        : '0.5',
         junitPitest        : '1.2.1',
         jackson            : '2.18.2',
-        launchDarklySdk    : '5.10.9',
+        launchDarklySdk    : '7.10.2',
         flyway              : '11.13.0',
         lombok              : '1.18.40',
         reformLogging       : '6.1.9',