Upgrade more dependencies and plugins (#22)

Author: sbabcoc

pom.xml

@@ -30,12 +30,12 @@
     <testng.version>6.10</testng.version>
     <compiler-plugin.version>3.8.1</compiler-plugin.version>
     <surefire-plugin.version>3.0.0-M5</surefire-plugin.version>
-    <source-plugin.version>3.2.0</source-plugin.version>
-    <javadoc-plugin.version>3.1.1</javadoc-plugin.version>
+    <source-plugin.version>3.2.1</source-plugin.version>
+    <javadoc-plugin.version>3.3.0</javadoc-plugin.version>
     <guava.version>30.1.1-android</guava.version>
-    <gpg-plugin.version>1.6</gpg-plugin.version>
+    <gpg-plugin.version>3.0.1</gpg-plugin.version>
     <staging-plugin.version>1.6.8</staging-plugin.version>
-    <release-plugin.version>2.5.3</release-plugin.version>
+    <release-plugin.version>3.0.0-M4</release-plugin.version>
     <apache-derby.version>10.12.1.1</apache-derby.version>
     <skipSigning>true</skipSigning>
   </properties>