Fix stale snapshot version in README and automate updates

Update the snapshot version in README.md from 0.2.1-java.0-SNAPSHOT to
0.2.3-java.1-SNAPSHOT to match the current pom.xml. Add a sed command
to the publish-maven workflow to update the snapshot version during
releases, preventing it from going stale again.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

.github/workflows/publish-maven.yml

@@ -121,6 +121,10 @@ jobs:
                   sed -i "s|<version>[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\(-java\.[0-9][0-9]*\)\{0,1\}</version>|<version>${VERSION}</version>|g" README.md
                   sed -i "s|copilot-sdk-java:[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\(-java\.[0-9][0-9]*\)\{0,1\}|copilot-sdk-java:${VERSION}|g" README.md
                   
+                  # Update snapshot version in README.md
+                  DEV_VERSION="${{ steps.versions.outputs.dev_version }}"
+                  sed -i "s|<version>[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\(-java\.[0-9][0-9]*\)\{0,1\}-SNAPSHOT</version>|<version>${DEV_VERSION}</version>|g" README.md
+                  
                   # Update version in jbang-example.java
                   sed -i "s|copilot-sdk-java:[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\(-java\.[0-9][0-9]*\)\{0,1\}|copilot-sdk-java:${VERSION}|g" jbang-example.java
                   

README.md

@@ -53,7 +53,7 @@ Snapshot builds of the next development version are published to Maven Central S
 <dependency>
     <groupId>com.github</groupId>
     <artifactId>copilot-sdk-java</artifactId>
-    <version>0.2.1-java.0-SNAPSHOT</version>
+    <version>0.2.3-java.1-SNAPSHOT</version>
 </dependency>
 ```