Bump org.spigotmc:spigot-api

Bumps org.spigotmc:spigot-api from 1.21.3-R0.1-SNAPSHOT to 1.21.7-R0.1-SNAPSHOT.

---
updated-dependencies:
- dependency-name: org.spigotmc:spigot-api
  dependency-version: 1.21.7-R0.1-SNAPSHOT
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -44,7 +44,7 @@ repositories {
 val adventureVersion = "4.16.0"
 
 dependencies {
-    compileOnly("org.spigotmc:spigot-api:1.21.3-R0.1-SNAPSHOT")
+    compileOnly("org.spigotmc:spigot-api:1.21.7-R0.1-SNAPSHOT")
 
     compileOnly("org.apache.commons:commons-lang3:3.17.0")
     compileOnly("org.projectlombok:lombok:1.18.32")