Bump org.spigotmc:spigot-api

Bumps org.spigotmc:spigot-api from 1.20.2-R0.1-SNAPSHOT to 1.20.4-R0.1-SNAPSHOT.

---
updated-dependencies:
- dependency-name: org.spigotmc:spigot-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -27,7 +27,7 @@ repositories {
 }
 
 dependencies {
-    compileOnly("org.spigotmc:spigot-api:1.20.2-R0.1-SNAPSHOT")
+    compileOnly("org.spigotmc:spigot-api:1.20.4-R0.1-SNAPSHOT")
 
     implementation("eu.okaeri:okaeri-configs-yaml-snakeyaml:5.0.0-beta.5")
     implementation("eu.okaeri:okaeri-configs-serdes-commons:5.0.0-beta.5")