Upgrade to Micrometer 1.1.19

Closes gh-23789

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -133,7 +133,7 @@
 		<logback.version>1.2.3</logback.version>
 		<lombok.version>1.18.16</lombok.version>
 		<mariadb.version>2.3.0</mariadb.version>
-		<micrometer.version>1.1.18</micrometer.version>
+		<micrometer.version>1.1.19</micrometer.version>
 		<mimepull.version>1.9.13</mimepull.version>
 		<mockito.version>2.23.4</mockito.version>
 		<mongo-driver-reactivestreams.version>1.9.2</mongo-driver-reactivestreams.version>