Bump org.apache.spark:spark-launcher_2.12 from 3.3.2 to 3.4.0 in /server

Bumps org.apache.spark:spark-launcher_2.12 from 3.3.2 to 3.4.0.

---
updated-dependencies:
- dependency-name: org.apache.spark:spark-launcher_2.12
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

server/build.gradle

@@ -22,7 +22,7 @@ micronaut {
 }
 mainClassName = "com.exacaster.lighter.Application"
 
-def sparkVersion = project.hasProperty("SPARK_VERSION") ? project.getProperty("SPARK_VERSION") : '3.3.2'
+def sparkVersion = project.hasProperty("SPARK_VERSION") ? project.getProperty("SPARK_VERSION") : '3.4.0'
 def hadoopVersion = '3.3.3'
 def k8sClientVersion = '6.5.1'
 def shedlockVersion = '4.44.0'