Fix stale shadow include group ID for emoji-java in EssentialsDiscord (#6467)

Commit 297d0e4 migrated `emoji-java` from Jitpack
(`com.github.MinnDevelopment`) to EssentialsX's own Maven repo
(`net.essentialsx.deps`), but the `include(dependency(...))` in the
`shadowJar` block was not updated to match, leaving the shadow JAR
unable to locate and bundle the dependency.

### Details

**Proposed fix:**
- Updated `EssentialsDiscord/build.gradle` shadowJar include to use the
correct group ID:
  ```groovy
  // Before
  include(dependency('com.github.MinnDevelopment:emoji-java'))

  // After
  include(dependency('net.essentialsx.deps:emoji-java'))
  ```

**Environments tested:**    

OS: 

Java version:  

- [ ] Most recent Paper version (1.XX.Y, git-Paper-BUILD)
- [ ] CraftBukkit/Spigot/Paper 1.12.2
- [ ] CraftBukkit 1.8.8


**Demonstration:**

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<details>

<summary>Original prompt</summary>

> never updated the shadow include group id here pls fix
> 
> Reference:
297d0e4


</details>



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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: JRoy <10731363+JRoy@users.noreply.github.com>

Author: Copilot

EssentialsDiscord/build.gradle

@@ -32,7 +32,7 @@ shadowJar {
         include(dependency('org.jetbrains.kotlin:kotlin-stdlib'))
 
         // Emoji
-        include(dependency('com.github.MinnDevelopment:emoji-java'))
+        include(dependency('net.essentialsx.deps:emoji-java'))
         include(dependency('org.json:json'))
 
         // discord-webhooks