Bump com.github.retrooper:packetevents-spigot from 2.9.1 to 2.9.4

Bumps [com.github.retrooper:packetevents-spigot](https://github.com/retrooper/packetevents) from 2.9.1 to 2.9.4.
- [Release notes](https://github.com/retrooper/packetevents/releases)
- [Changelog](https://github.com/retrooper/packetevents/blob/2.0/CHANGELOG.md)
- [Commits](retrooper/packetevents@v2.9.1...v2.9.4)

---
updated-dependencies:
- dependency-name: com.github.retrooper:packetevents-spigot
  dependency-version: 2.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -103,7 +103,7 @@
         <dependency>
             <groupId>com.github.retrooper</groupId>
             <artifactId>packetevents-spigot</artifactId>
-            <version>2.9.1</version>
+            <version>2.9.4</version>
             <scope>provided</scope>
         </dependency>
         <dependency>