[SPARK-54868][PYTHON][INFRA][FOLLOWUP] Increase test timeout to 450s

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

Increase the test timeout from 300s to 450s.

### Why are the changes needed?

We have tests that's longer than that. Having a super large timeout is not ideal but until we break the large test into smaller ones (or accelerate it), we need to keep the CI stable.

https://github.com/apache/spark/actions/runs/20594052053/job/59144974154

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

No.

### How was this patch tested?

Minor env change.

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

No

Closes #53647 from gaogaotiantian/increase-timeout.

Authored-by: Tian Gao <[email protected]>
Signed-off-by: Ruifeng Zheng <[email protected]>

Author: gaogaotiantian

.github/workflows/build_and_test.yml

@@ -566,7 +566,7 @@ jobs:
       SKIP_PACKAGING: true
       METASPACE_SIZE: 1g
       BRANCH: ${{ inputs.branch }}
-      PYSPARK_TEST_TIMEOUT: 300
+      PYSPARK_TEST_TIMEOUT: 450
     steps:
     - name: Checkout Spark repository
       uses: actions/checkout@v4