[SPARK-47115][INFRA] Use larger memory for Maven builds

### What changes were proposed in this pull request?

This PR proposes to use bigger memory during Maven builds. GitHub Actions runners now have more memory than before (https://docs.github.com/en/actions/using-github-hosted-runners/about-larger-runners/about-larger-runners) so we can increase.

https://github.com/HyukjinKwon/spark/actions/runs/7984135094/job/21800463337

### Why are the changes needed?

For stable Maven builds.
Some tests consistently fail:

```
*** RUN ABORTED ***
An exception or error caused a run to abort: unable to create native thread: possibly out of memory or process/resource limits reached
  java.lang.OutOfMemoryError: unable to create native thread: possibly out of memory or process/resource limits reached
  at java.base/java.lang.Thread.start0(Native Method)
  at java.base/java.lang.Thread.start(Thread.java:1553)
  at java.base/java.lang.System$2.start(System.java:2577)
  at java.base/jdk.internal.vm.SharedThreadContainer.start(SharedThreadContainer.java:152)
  at java.base/java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:953)
  at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1364)
  at org.apache.spark.rpc.netty.SharedMessageLoop.$anonfun$threadpool$1(MessageLoop.scala:128)
  at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:190)
  at org.apache.spark.rpc.netty.SharedMessageLoop.<init>(MessageLoop.scala:127)
  at org.apache.spark.rpc.netty.Dispatcher.sharedLoop$lzycompute(Dispatcher.scala:46)
  ...
Warning:  The requested profile "volcano" could not be activated because it does not exist.
Warning:  The requested profile "hive" could not be activated because it does not exist.
Error:  Failed to execute goal org.scalatest:scalatest-maven-plugin:2.2.0:test (test) on project spark-core_2.13: There are test failures -> [Help 1]
Error:
Error:  To see the full stack trace of the errors, re-run Maven with the -e switch.
Error:  Re-run Maven using the -X switch to enable full debug logging.
Error:
Error:  For more information about the errors and possible solutions, please read the following articles:
Error:  [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Error:
Error:  After correcting the problems, you can resume the build with the command
Error:    mvn <args> -rf :spark-core_2.13
Error: Process completed with exit code 1.
```

### Does this PR introduce _any_ user-facing change?

No, dev-only

### How was this patch tested?

Will monitor the scheduled jobs. It's a simple memory configuration change.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #45195 from HyukjinKwon/bigger-macos.

Authored-by: Hyukjin Kwon <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: HyukjinKwon

.github/workflows/maven_test.yml

@@ -185,7 +185,7 @@ jobs:
       - name: Run tests
         env: ${{ fromJSON(inputs.envs) }}
         run: |
-          export MAVEN_OPTS="-Xss64m -Xmx4g -Xms4g -XX:ReservedCodeCacheSize=128m -Dorg.slf4j.simpleLogger.defaultLogLevel=WARN"
+          export MAVEN_OPTS="-Xss64m -Xmx6g -Xms6g -XX:ReservedCodeCacheSize=128m -Dorg.slf4j.simpleLogger.defaultLogLevel=WARN"
           export MAVEN_CLI_OPTS="--no-transfer-progress"
           export JAVA_VERSION=${{ matrix.java }}
           # Replace with the real module name, for example, connector#kafka-0-10 -> connector/kafka-0-10