Build against latest Paper API and local MobArena; fix CI JDK/artifact upload

pom.xml

@@ -34,19 +34,19 @@
       <version>2.2.1</version>
     </dependency>
 
-    <!-- https://hub.spigotmc.org/nexus/content/groups/public/org/spigotmc/spigot-api/ -->
+    <!-- https://repo.papermc.io/repository/maven-public/io/papermc/paper/paper-api/ -->
     <dependency>
-      <groupId>org.spigotmc</groupId>
-      <artifactId>spigot-api</artifactId>
-      <version>1.17-R0.1-SNAPSHOT</version>
+      <groupId>io.papermc.paper</groupId>
+      <artifactId>paper-api</artifactId>
+      <version>26.2.build.84-stable</version>
       <scope>provided</scope>
     </dependency>
 
-    <!-- https://jitpack.io/#garbagemule/MobArena -->
+    <!-- Built and installed locally from F:\skywalker3200\MobArena via `./gradlew publishToMavenLocal` -->
     <dependency>
-      <groupId>com.github.garbagemule</groupId>
+      <groupId>com.garbagemule</groupId>
       <artifactId>MobArena</artifactId>
-      <version>b99713f1</version>
+      <version>0.109.1-tss3</version>
       <scope>provided</scope>
     </dependency>
 
@@ -133,13 +133,8 @@
 
   <repositories>
     <repository>
-      <id>spigot-repo</id>
-      <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
-    </repository>
-
-    <repository>
-      <id>jitpack.io</id>
-      <url>https://jitpack.io</url>
+      <id>papermc</id>
+      <url>https://repo.papermc.io/repository/maven-public/</url>
     </repository>
   </repositories>
 
@@ -157,8 +152,7 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.8.1</version>
         <configuration>
-          <source>11</source>
-          <target>11</target>
+          <release>25</release>
         </configuration>
       </plugin>
 
@@ -171,7 +165,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>3.2.4</version>
+        <version>3.6.2</version>
         <executions>
           <execution>
             <phase>package</phase>