[SPARK-35655][BUILD] Upgrade HtmlUnit and its related artifacts to 2.50

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

This PR upgrades HtmlUnit and its related artifacts to `2.50`.

### Why are the changes needed?

We currently uses 2.40 but 2.41+ seem to include bunch of bug fixes and improvements especially for JavaScript and CSS.
https://htmlunit.sourceforge.io/changes-report.html#a2.50.0

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

No.

### How was this patch tested?

All the `UISeleniumSuite` which use HtmlUnit pass on my laptop.

Closes #32789 from sarutak/upgrade-htmlunit250.

Authored-by: Kousuke Saruta <[email protected]>
Signed-off-by: Gengliang Wang <[email protected]>

Author: sarutak

pom.xml

@@ -193,7 +193,7 @@
     <antlr4.version>4.8</antlr4.version>
     <jpam.version>1.1</jpam.version>
     <selenium.version>3.141.59</selenium.version>
-    <htmlunit.version>2.40.0</htmlunit.version>
+    <htmlunit.version>2.50.0</htmlunit.version>
     <maven-antrun.version>1.8</maven-antrun.version>
     <commons-crypto.version>1.1.0</commons-crypto.version>
     <commons-cli.version>1.2</commons-cli.version>