Pin Prometheus to 0.9.x and consolidate versions

fixes gh-2825

Author: jonatan-ivanov

benchmarks/benchmarks-core/build.gradle

@@ -7,7 +7,7 @@ dependencies {
     jmh project(':micrometer-registry-prometheus')
 
     jmh 'io.dropwizard.metrics5:metrics-core:latest.release'
-    jmh 'io.prometheus:simpleclient_common:latest.release'
+    jmh 'io.prometheus:simpleclient_common:0.9.+'
 
     jmh 'io.dropwizard.metrics:metrics-core'
     jmh 'com.google.guava:guava'

benchmarks/benchmarks-core/gradle.lockfile

@@ -32,8 +32,8 @@ def VERSIONS = [
         'io.projectreactor:reactor-core:3.3.+',
         'io.projectreactor:reactor-test:3.3.+',
         'io.projectreactor.netty:reactor-netty:0.9.+',
-        'io.prometheus:simpleclient_common:latest.release',
-        'io.prometheus:simpleclient_pushgateway:latest.release',
+        'io.prometheus:simpleclient_common:0.9.+',
+        'io.prometheus:simpleclient_pushgateway:0.9.+',
         'javax.cache:cache-api:latest.release',
         'javax.inject:javax.inject:1',
         'javax.xml.bind:jaxb-api:2.3.+',