[SPARK-34158] Incorrect url of the only developer Matei in pom.xml

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

Update the Incorrect URL of the only developer Matei in pom.xml

### Why are the changes needed?

The current link was broken

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

No

### How was this patch tested?

change the link to https://cs.stanford.edu/people/matei/

Closes #31512 from pingsutw/SPARK-34158.

Authored-by: Kevin <pingsutw@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

pom.xml

@@ -48,7 +48,7 @@
       <id>matei</id>
       <name>Matei Zaharia</name>
       <email>matei.zaharia@gmail.com</email>
-      <url>http://www.cs.berkeley.edu/~matei</url>
+      <url>https://cs.stanford.edu/people/matei</url>
       <organization>Apache Software Foundation</organization>
       <organizationUrl>http://spark.apache.org</organizationUrl>
     </developer>