Update some plugins, and inline some settings from the [deprecated](https://github.com/sonatype/oss-parents) oss-parent

Compare previous work on other projects, like cl/395095285 and cl/492304151.

This change should improve the chances that our shared release script can work for `j2objc-annotations`. (Specifically, I think we've had trouble with the old `maven-gpg-plugin` version, like in cl/492199969.)

PiperOrigin-RevId: 607383183

Author: cpovirk

annotations/pom.xml

@@ -23,12 +23,6 @@
     <maven.compiler.target>1.7</maven.compiler.target>
   </properties>
 
-  <parent>
-    <groupId>org.sonatype.oss</groupId>
-    <artifactId>oss-parent</artifactId>
-    <version>9</version>
-  </parent>
-
   <groupId>com.google.j2objc</groupId>
   <artifactId>j2objc-annotations</artifactId>
   <packaging>jar</packaging>
@@ -49,12 +43,25 @@
     </license>
   </licenses>
 
+  <distributionManagement>
+    <snapshotRepository>
+      <id>sonatype-nexus-snapshots</id>
+      <name>Sonatype Nexus Snapshots</name>
+      <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
+    </snapshotRepository>
+    <repository>
+      <id>sonatype-nexus-staging</id>
+      <name>Nexus Release Repository</name>
+      <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+    </repository>
+  </distributionManagement>
+
   <build>
     <plugins>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.10.3</version>
+        <version>3.6.3</version>
         <executions>
           <execution>
             <id>generate-docs</id>
@@ -66,7 +73,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>2.4</version>
+        <version>3.3.0</version>
         <executions>
           <execution>
             <id>generate-sources</id>
@@ -78,7 +85,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-gpg-plugin</artifactId>
-        <version>1.6</version>
+        <version>3.1.0</version>
         <executions>
           <execution>
             <id>sign-artifacts</id>