[maven-release-plugin] prepare for next development iteration

base/pom.xml

@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.fasterxml.jackson</groupId>
     <artifactId>jackson-bom</artifactId>
-    <version>2.12.3</version>
+    <version>2.12.4-SNAPSHOT</version>
   </parent>
   <artifactId>jackson-base</artifactId>
   <name>Jackson Base</name>

pom.xml

@@ -14,7 +14,7 @@
   <description>Bill of Materials pom for getting full, complete set of compatible versions
 of Jackson components maintained by FasterXML.com
   </description>
-  <version>2.12.3</version>
+  <version>2.12.4-SNAPSHOT</version>
   <packaging>pom</packaging>
 
   <modules>
@@ -45,7 +45,7 @@ of Jackson components maintained by FasterXML.com
     <connection>scm:git:[email protected]:FasterXML/jackson-bom.git</connection>
     <developerConnection>scm:git:[email protected]:FasterXML/jackson-bom.git</developerConnection>
     <url>https://github.com/FasterXML/jackson-bom</url>
-    <tag>jackson-bom-2.12.3</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>