deps: update dependency org.codehaus.plexus:plexus-utils to v4

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.codehaus.plexus:plexus-utils (source)	3.6.0 -> 4.0.2

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[lqiu96]

Error:

Error:  Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project google-cloud-bom-dashboard: Compilation failure: Compilation failure: 
Error:  /home/runner/work/java-cloud-bom/java-cloud-bom/dashboard/src/main/java/com/google/cloud/tools/opensource/cloudbomdashboard/ArtifactMavenData.java:[43,40] error: package org.codehaus.plexus.util.xml.pull does not exist
Error:  /home/runner/work/java-cloud-bom/java-cloud-bom/dashboard/src/main/java/com/google/cloud/tools/opensource/cloudbomdashboard/ArtifactMavenData.java:[167,13] error: cannot find symbol
Error:    symbol:   class XmlPullParserException
Error:    location: class ArtifactMavenData
Error:  /home/runner/work/java-cloud-bom/java-cloud-bom/dashboard/src/main/java/com/google/cloud/tools/opensource/cloudbomdashboard/ArtifactMavenData.java:[263,13] error: cannot find symbol
Error:    symbol:   class XmlPullParserException
Error:    location: class ArtifactMavenData
Error:  -> [Help 1]
Error:  
Error:  To see the full stack trace of the errors, re-run Maven with the -e switch.
Error:  Re-run Maven using the -X switch to enable full debug logging.
Error:  
Error:  For more information about the errors and possible solutions, please read the following articles:
Error:  [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Error: Process completed with exit code 1.