Updates framework version to 7.0.0-M7

Author: spencergibb

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/gradle.properties

@@ -19,7 +19,7 @@ verifierVersion=5.0.0-SNAPSHOT
 org.gradle.daemon=false
 aetherVersion=1.1.0
 springCloudBuildVersion=5.0.0-SNAPSHOT
-springVersion=7.0.0-SNAPSHOT
+springVersion=7.0.0-M7
 jacksonDatabindVersion=2.13.2.1
 mavenResolverVersion=1.9.18
 jgitVersion=5.12.0.202106070339-r