Upgrade to Micrometer 1.9.0-M4.

Author: jxblum

gradle.properties

@@ -4,7 +4,7 @@ apacheGeodeVersion=1.14.4
 awaitilityVersion=4.2.0
 eclipseJettyVersion=9.4.39.v20210325
 findbugsVersion=3.0.2
-micrometerVersion=1.9.0-M3
+micrometerVersion=1.9.0-M4
 multithreadedtcVersion=1.01
 pivotalCloudCacheVersion=1.14.3
 pivotalGemFireVersion=9.10.14