Specify a new plexus-io version for maven-jar-plugin, too.

We already do for `maven-source-plugin`.

Timings for `mvn clean install -DskipTests`:

- Before: Total time:  08:24 min
- After: Total time:  02:29 min

The slowness that this CL addresses only surfaces under certain configurations, perhaps those with large/remote definitions of Unix groups? I worked around it a while back for my main machine by using `chgrp`, but I was reminded of it today by unicode-org/icu#3459, and I was able to reproduce the slowness on a temporary machine that I'm using on account of some network trouble and an impending desk move.

I don't expect for GitHub CI to be affected, but I do wonder if this could help with our local releases. I know that our releases are slow because they have to run a lot of tests, but maybe they have been further slowed by the problem I'm addressing here? After all, they build under `/tmp` by default, and my `chgrp` workaround wouldn't affect that. If only Maven's output weren't [so verbose that our release script has to hide most of it](https://www.club.cc.cmu.edu/~cmccabe/blog_the_bad_build_system_drinking_game.html#:~:text=Take%20three%20shots%20if%20it%20generates%20more%20than%20a%20megabyte%20of%20output)...

RELNOTES=n/a
PiperOrigin-RevId: 742856755

Author: cpovirk

android/pom.xml

@@ -248,6 +248,14 @@
               </manifestEntries>
             </archive>
           </configuration>
+          <dependencies>
+            <dependency>
+              <groupId>org.codehaus.plexus</groupId>
+              <artifactId>plexus-io</artifactId>
+              <!-- We need at least 3.5.1 to avoid https://github.com/codehaus-plexus/plexus-io/issues/109. Once we upgrade maven-jar-plugin itself to a version new enough to depend on 3.5.1 or higher, we can remove this override. -->
+              <version>3.5.1</version>
+            </dependency>
+          </dependencies>
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>

pom.xml

@@ -249,6 +249,14 @@
               </manifestEntries>
             </archive>
           </configuration>
+          <dependencies>
+            <dependency>
+              <groupId>org.codehaus.plexus</groupId>
+              <artifactId>plexus-io</artifactId>
+              <!-- We need at least 3.5.1 to avoid https://github.com/codehaus-plexus/plexus-io/issues/109. Once we upgrade maven-jar-plugin itself to a version new enough to depend on 3.5.1 or higher, we can remove this override. -->
+              <version>3.5.1</version>
+            </dependency>
+          </dependencies>
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>