Bump version for a couple of maven plugins (envoyproxy#203)

Signed-off-by: rulex123 <[email protected]>

Author: rulex123

.circleci/config.yml

@@ -58,5 +58,4 @@ jobs:
 
               mvn -B -s .circleci/settings-snapshots.xml deploy
             fi
-
       - run: bash <(curl -s https://codecov.io/bash)

pom.xml

@@ -39,8 +39,8 @@
         <jacoco-maven-plugin.version>0.8.5</jacoco-maven-plugin.version>
         <maven-checkstyle-plugin.version>3.0.0</maven-checkstyle-plugin.version>
         <maven-failsafe-plugin.version>2.21.0</maven-failsafe-plugin.version>
-        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
-        <maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
+        <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
+        <maven-javadoc-plugin.version>3.3.1</maven-javadoc-plugin.version>
         <maven-release-plugin.version>2.5.3</maven-release-plugin.version>
         <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
         <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>