Remove oss-parent from pom.xml

[cowwoc]

The top-level pom.xml contains:

<parent>
  <groupId>org.sonatype.oss</groupId>
  <artifactId>oss-parent</artifactId>
  <version>9</version>
</parent>

Per https://github.com/sonatype/oss-parents this parent pom is deprecated.

The replacement looks something like this:

<build>
  <plugins>
    <plugin>
      <groupId>org.sonatype.plugins</groupId>
      <artifactId>nexus-staging-maven-plugin</artifactId>
      <version>1.6.13</version>
      <extensions>true</extensions>
      <configuration>
        <serverId>maven-central-releases</serverId>
        <nexusUrl>https://oss.sonatype.org/</nexusUrl>
      </configuration>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-source-plugin</artifactId>
      <version>3.2.1</version>
      <executions>
        <execution>
          <id>attach-sources</id>
          <goals>
            <goal>jar-no-fork</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
    <plugin>
      <artifactId>maven-javadoc-plugin</artifactId>
      <version>${maven-javadoc-plugin.version}</version>
    </plugin>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-gpg-plugin</artifactId>
      <version>3.0.1</version>
      <executions>
        <execution>
          <id>sign-artifacts</id>
          <phase>verify</phase>
          <goals>
            <goal>sign</goal>
          </goals>
          <configuration>
            <!-- See https://maven.apache.org/guides/mini/guide-encryption.html -->
            <passphraseServerId>gpg.passphrase</passphraseServerId>
            <!-- See https://stackoverflow.com/a/53992951/14731 -->
            <gpgArguments>
              <arg>--pinentry-mode</arg>
              <arg>loopback</arg>
            </gpgArguments>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

If you run into any trouble, https://central.sonatype.org/publish/publish-guide/ explains what you need to do.