Post-release: bump to 5.0.4-SNAPSHOT

Following the 5.0.3 release (tag v5.0.3). Bumps pom.xml and the README
snapshot dependency example to 5.0.4-SNAPSHOT; the release dependency
examples stay at 5.0.3.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01URUX3HiqQ1wzJnT8qn8c8E

Author: claude

README.md

@@ -144,7 +144,7 @@ To use the latest snapshot, add the repository and dependency to your `pom.xml`:
 <dependency>
     <groupId>net.ladenthin</groupId>
     <artifactId>llama</artifactId>
-    <version>5.0.3-SNAPSHOT</version>
+    <version>5.0.4-SNAPSHOT</version>
 </dependency>
 ```
 

pom.xml

@@ -12,7 +12,7 @@ SPDX-License-Identifier: MIT
 
 	<groupId>net.ladenthin</groupId>
 	<artifactId>llama</artifactId>
-	<version>5.0.3</version>
+	<version>5.0.4-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<name>${project.groupId}:${project.artifactId}</name>