Switch beast3 dependency from SNAPSHOT to 2.8.0-beta1 on Maven Central

Remove GitHub Packages repository block (no longer needed).

Author: alexeid

pom.xml

@@ -44,7 +44,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <maven.compiler.release>25</maven.compiler.release>
 
-        <beast.version>2.8.0-SNAPSHOT</beast.version>
+        <beast.version>2.8.0-beta1</beast.version>
         <javafx.version>25.0.2</javafx.version>
         <junit.version>5.8.2</junit.version>
         <beast.main>beastfx.app.beauti.Beauti</beast.main>
@@ -96,13 +96,6 @@
         </dependencies>
     </dependencyManagement>
 
-    <repositories>
-        <repository>
-            <id>github</id>
-            <url>https://maven.pkg.github.com/CompEvol/beast3</url>
-        </repository>
-    </repositories>
-
     <build>
         <pluginManagement>
             <plugins>