Upgrade Micrometer to 1.3.7

Author: garyrussell

build.gradle

@@ -56,7 +56,7 @@ ext {
 	junitJupiterVersion = '5.5.2'
 	kafkaVersion = '2.4.1'
 	log4jVersion = '2.12.1'
-	micrometerVersion = '1.3.6'
+	micrometerVersion = '1.3.7'
 	mockitoVersion = '3.0.0'
 	reactorVersion = 'Dysprosium-SR6'
 	scalaVersion = '2.12'