Update dependency com.github.hmcts:service-auth-provider-java-client …

…to v5.3.0 (#698)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

build.gradle

@@ -243,7 +243,7 @@ def versions = [
     lombok              : '1.18.36',
     reformLogging       : '6.1.7',
     restAssured         : '5.5.0',
-    s2sClient           : '5.2.0',
+    s2sClient           : '5.3.0',
     sonarPitest         : '0.5',
     springBoot          : springBoot.class.package.implementationVersion,
     springFramework     : '6.1.14',