mvnup 4.0.0-rc-5 adds strange `<pluginManagement>` section that breaks the build

[rschmitt]

Affected version

4.0.0-rc-5

Bug description

I ran mvnup apply --model-version 4.1.0 on apache/httpcomponents-client@ee6ebee and it added the following to the root pom.xml for no clear reason:

   <build>
     <defaultGoal>clean verify</defaultGoal>
+
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-remote-resources-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+      
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-shade-plugin</artifactId>
+          <version>3.5.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
     <plugins>
       <plugin>

The resulting build seems to just hang forever. Deleting the quoted section (or, more specifically, the maven-remote-resources-plugin) causes it to succeed.

Incidentally, I'm not a fan of the trailing whitespace inserted by the tool. Other than that, I can't really complain.