Revert temporary "fix(release): adjustments for Maven release"

This reverts commit 81714df.

pom.xml

@@ -34,7 +34,6 @@
     <maven.javadoc.failOnError>false</maven.javadoc.failOnError>
     <!-- disable javadoc linter for JDK8 to not fail on incomplete javadoc -->
     <additionalparam>-Xdoclint:none</additionalparam>
-    <plugin.version.gpg>1.6</plugin.version.gpg>
   </properties>
 
   <dependencyManagement>
@@ -151,28 +150,6 @@
   <build>
     <defaultGoal>clean install</defaultGoal>
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-gpg-plugin</artifactId>
-        <version>1.6</version>
-        <executions>
-          <execution>
-            <id>sign-artifacts</id>
-            <phase>verify</phase>
-            <goals>
-              <goal>sign</goal>
-            </goals>
-            <configuration>
-              <passphrase>${gpg.passphrase}</passphrase>
-              <gpgArguments>
-                <arg>--batch</arg>
-                <arg>--pinentry-mode</arg>
-                <arg>loopback</arg>
-              </gpgArguments>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.8.1</version>