[SPARK-56628] Update lombok to 1.18.46

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

This PR aims to update `lombok` to 1.18.46.

### Why are the changes needed?

To bring the latest bug fixes and the official JDK 26 support.

- https://projectlombok.org/changelog
  - projectlombok/lombok#4019
  - Spring Tools Suite 5 supported

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

No.

### How was this patch tested?

Pass the CIs.

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

Generated-by: Claude Opus 4.7

Closes #643 from dongjoon-hyun/SPARK-56628.

Authored-by: Dongjoon Hyun <dongjoon@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

Author: dongjoon-hyun

gradle/libs.versions.toml

@@ -16,7 +16,7 @@
 # under the License.
 [versions]
 fabric8 = "7.6.1"
-lombok = "1.18.44"
+lombok = "1.18.46"
 netty = "4.2.12.Final"
 operator-sdk = "5.3.3"
 dropwizard-metrics = "4.2.38"