Bump spark-core_2.12 from 3.2.2 to 3.4.0 in /dolphinscheduler-bom

Bumps spark-core_2.12 from 3.2.2 to 3.4.0.

---
updated-dependencies:
- dependency-name: org.apache.spark:spark-core_2.12
  dependency-type: direct:production
...

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

dolphinscheduler-bom/pom.xml

@@ -92,7 +92,7 @@
         <gson.version>2.9.1</gson.version>
         <dropwizard.metrics-version>4.2.11</dropwizard.metrics-version>
         <snappy.version>1.1.8.4</snappy.version>
-        <spark.version>3.2.2</spark.version>
+        <spark.version>3.4.0</spark.version>
         <janino.version>3.0.16</janino.version>
         <snakeyaml.version>1.33</snakeyaml.version>
         <htrace.version>4.1.1</htrace.version>