Bump com.github.retrooper:packetevents-spigot

Bumps [com.github.retrooper:packetevents-spigot](https://github.com/retrooper/packetevents) from 2.9.0-SNAPSHOT to 2.9.4.
- [Release notes](https://github.com/retrooper/packetevents/releases)
- [Changelog](https://github.com/retrooper/packetevents/blob/2.0/CHANGELOG.md)
- [Commits](https://github.com/retrooper/packetevents/commits/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

@@ -39,7 +39,7 @@
         <depend.examination-api>1.3.0</depend.examination-api>
         <depend.examination-string>1.3.0</depend.examination-string>
         <depend.nbtapi>2.15.0</depend.nbtapi>
-        <depend.packetevents>2.9.0-SNAPSHOT</depend.packetevents>
+        <depend.packetevents>2.9.4</depend.packetevents>
         <depend.paper>1.21-R0.1-SNAPSHOT</depend.paper>
         <depend.protocollib>5.3.0</depend.protocollib>
         <depend.vault>1.7.1</depend.vault>