chore: bump to 2.7.4-SNAPSHOT

Author: SteKoe

pom.xml

@@ -26,7 +26,7 @@
     <description>Spring Boot Admin</description>
     <url>https://github.com/codecentric/spring-boot-admin/</url>
     <properties>
-        <revision>2.7.3</revision>
+        <revision>2.7.4-SNAPSHOT</revision>
         <java.version>1.8</java.version>
 
         <maven.compiler.source>${java.version}</maven.compiler.source>