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

pom.xml

@@ -13,7 +13,7 @@
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <name>Jackson-core</name>
-  <version>2.15.4</version>
+  <version>2.15.5-SNAPSHOT</version>
   <packaging>jar</packaging>
   <description>Core Jackson processing abstractions (aka Streaming API), implementation for JSON</description>
   <licenses>
@@ -30,7 +30,7 @@
     <connection>scm:git:git@github.com:FasterXML/jackson-core.git</connection>
     <developerConnection>scm:git:git@github.com:FasterXML/jackson-core.git</developerConnection>
     <url>https://github.com/FasterXML/jackson-core</url>
-    <tag>jackson-core-2.15.4</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>
@@ -58,7 +58,7 @@ com.fasterxml.jackson.core.*;version=${project.version}
     <packageVersion.package>${project.groupId}.json</packageVersion.package>
 
     <!-- for Reproducible Builds -->
-    <project.build.outputTimestamp>2024-02-15T17:07:40Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2024-02-15T17:08:28Z</project.build.outputTimestamp>
   </properties>
 
   <!-- Alas, need to include snapshot reference since otherwise can not find